Other places to search wall decals are Etsy, like this simple "birds on a branch" decal (below) that makes the blase background wall, come to life. (Get this instead of wallpaper for $27).
Or maybe you've been wanting a chandelier? Well, this one's only $30.
Don't have the money to replace the tile in your kitchen? Why not go with some Moroccan bubbles? You get 30 graphics for $52.
However, a word of caution: Some of the decals in a rainbow of shades could overwhelm your space and make it look like a kid's room. So to not overshadow the rest of the room and keep it sophisticated, try sticking to a two-color scheme (white/black, grey/white, green/white, etc.)
That's decal-ious.