Wall decals arespecially prepared paper bearing a picture or design for transfer to wood, metal, glass,etc and as the name suggests walls of course. I myself being an interior designer have an opportunity to play with colours all the time but my all time favorite is white with a splash of color and that makes my style statement. Well , I really don't like to impose my preferences on my clients as its them , who ultimately have to live with those colours but I have rarely failed to sell my ideas to them. Here is a tip along with the links ( where one can source the relevant products from ) that can make a difference to your home as well .
http://www.fabfurnish.com/home-decor/wall-decals-stickers/
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