Decoupaged switch plate cover - 

Mod Podge (Michael's)

wrapping paper or colored paper, paint brush, scissors, tape (any craft store)

Cut your desired piece of paper to a size that is slightly larger than the switch plate cover. Paint Mod Podge on the entire front, then put down the paper. Wrap the excess paper over the side of the switch plate, and tape in place. While the front of the switch plate it face down, use scissor to cut the light switch openings. Pull the paper around to make clean sides, and tape in place. 

Lastly, paint another coat of Mod Podge over the whole switch plate. I like to use the kind with the matte finish, but the glossy works great too.