I've already experienced the joy of painting a tree mural (and then painting back over) but I still enjoy this idea of trees indoors. It's very easy to paint a tree, but for another solution use vinyl decals like these from NouWall on Room decor design|
Branch out and create something cool in your bedroom or anywhere in your house with this easy to use (and re-usable) wall decal. $59.95 at www.amazon.com. Just used for a staging job and client loved it!
Bed Bath & Beyond | WallVerbs™ 13-Piece "Family" Tree Set in Black :: Design a visual family tree on your wall with the WallVerbs Family Tree Set. This inclusive set holds up to 10 photos and features decorative accents that will let you personalize your home beautifully. $49.99