As the calendar turns to fall, thoughts of summer fun and outdoor entertaining are slowly replaced with plans for cooler weather and spending more time indoors. Before inviting in family and friends, you can update your home's interior with the hottest trends for fall.

Crisp, clean lines in an array of versatile neutrals take center stage with pops of color and pattern adding personality to any space.

The result, say Tristate interior designers, is a casual and inviting decor that offers longevity and the opportunities for individualization.

Popular furniture styles offer clean, straight lines for an urban, contemporary look.

"The look of popular furniture pieces is simplified and not too fussy or fancy," says Tom Kordenbrock, owner of Kordenbrock Interiors in Crescent Springs, Ky.

"Tufting is also getting popular. In a plain materials, tufting on the inside seat back can give a dramatic look."

With key furniture pieces taking up much of a room's space and a homeowner's budget, selecting simply designed furnishings in neutral colors offers a versatility not to be had with bolder colors or patterns.

Sofas and other large pieces in shades of beige, gray and white allow for a room to be transformed with colorful accessories.

"By leaning toward neutrals for the primary pieces, such as the sofa, you can trade out the pillows or the wall paint to quickly and cost effectively change the feel," says Amy S. Holt, owner of Designs on Madison in Cincinnati.

"Colors can be added in a chair, pillows, rugs or artwork."

Taking its cues from fashion, this year's color palette for home design has already been seen on the runways and in our closets. As it does each year, the New Jersey-based Pantone Color Institute surveyed fashion designers to determine the most important color trends. For 2012, Tangerine Tango was named color of the year, while other trending colors for fall include Pink Flambe, Bright Chartreuse, Ultramarine Green and Olympian Blue. Adding pops of these colors can dress up a room of neutrals.

"These are transitional cooler colors that lend themselves to using gray as a neutral," says Jill Holt Koch, an interior designer with Designs on Madison.

In addition to the jewel tones, according to the Pantone Color Institute, other colors coming into popularity are more muted such as Rose Smoke, which is a creamy light blush, and Rhapsody, a muted plum color. Yellow and gray is another popular combination. For Karen Sacksteder, owner of Sacksteder's Interiors with locations in Cincinnati and New Trenton, Ind., it is these lighter tones that she most likes for fall.

"Rather than falling into deeper hues of colors for fall, I see lighter tones of neutrals accented with shades of browns, blues, and lighter oranges, reds, and greens," says Sacksteder.

"These colors can still coordinate with darker pieces."

Go Ahead & Paint

One of the easiest and more cost-effective ways to incorporate color into your home is by adding a fresh coat of paint to each room. Adding paint color is a simple and inexpensive way to brighten up your space or change its overall feel.

"People are not shying away from bold colors on the wall. Painting is an easy way to change colors without making a major commitment. Color on the walls is one of the first things that get considered because of the cost efficiency of changing colors," says Kordenbrock, who added that changing accessories such as pillows, rugs, and artwork is another simple method for including color in a room.

"There is such a world of throw pillows out there. It lets people be more creative on their own. It doesn't have to be a traditional pattern. You can use them contemporarily but each piece must be striking and attention getting. Few things have to do a lot more," he says.

Though more difficult to change, new options in flooring and wall coverings offer a multitude of options to home owners making more extensive interior changes. Improved manufacturing methods in both have created a more durable and cost effective selection. Engineered wood flooring offers a hard wood feel with a reduced price tag. Unlike laminate flooring which looks like wood but is not made of real wood, engineered wood floors are made of a sandwich of finished wood on top with plywood underneath which provides additional strength.

Endless Options

"The pre-engineered floors look much more real today. It has an advantage of reduced cost and is a stronger product," Kordenbrock says. "Because of the popularity of wood floors, area rugs have become another strong trend. They offer endless options of colors, styles, and patterns."

Strand woven bamboo floors, carpet tiles, and newly improved versions of vinyl flooring are other options to consider.

After a decades-long hiatus, wallpaper is returning to popularity. But this is not the full walls of floral and plaid prints once in vogue. Instead, wallpaper with graphic designs is being used to add pops of color and design to a room.

"We are doing lots of graphic prints with two to three colors at the most," says Holt, who gave the example of papering the inside of a bookcase with a graphic design. "People are shying away from faux finishes which can be difficult to cover later. The papers give the option for cleaner lines and finishes."

While the economy always plays a role in a homeowner's design choices, many are also considering the environment when making decisions.

Manufacturers have answered the call for more environmentally friendly options for those wishing to follow the green trend. Flooring that doesn't require adhesives and the use of repurposed materials are among the easiest methods for incorporating eco-friendly products to your home. Replacing appliances and lighting with energy efficient models is another method.

For those looking for more green options, Sacksteder partners clients with local companies specializing in natural, recycled, and renewable products such as Greener Stock owned by Heather Curless.

Making You Happy

Regardless of whether it fits with current trends, each of the designers agrees that the most important consideration when creating any new home design is to find a design that makes you happy. Bringing an inspiration, such as a photo or a specific piece that speaks to your heart, can help a designer develop a design that fits your needs.

Sacksteder, who has spent more than 25 years as a designer watching trends come and go, also suggests knowing your needs for the room and trusting in your own opinions.

"Everyone has their own needs and it is important to meet those needs," she says.

"My job isn't to sell you. My job is to help you. I offer suggestions and teach you to design your home. Your home should be a representation of your personality. If you can create your own outfit, you can create your own room, but it is always OK to ask for help from an expert."