I think carpet tiles can be a great way to give a room versitility. They are easy to install and can be changed out at a whim if you decided to change colors with the seasons or get tired of a pattern or need to replace a soiled area.

FLOR offers a great selection of carpet tiles. I came across this one pattern that looks like it belongs in an anthropologie catalog photograph or in the store.

There are so many colors, textures to choose from you can never get bored.

Images from FLOR website