Matt & I just finished a small project I've been wanting to do for a long time. We built chunky floating shelves for my studio closet out of mdf board from Home Depot, caulked the edges & seams, and primed and painted them white to pop against the orange background!
After we bought the house, we painted this room white with one orange accent wall and across from that, the inside of the open closet. Previously, the closet had a curtain on a tension rod and everything was beige. The clothes rod (above left) was already there. We took advantage of that and built the shelves around the existing pieces.
We left the bottom of the lower shelf open so you can still use the rod for hanging clothes, but it's hidden behind the front panel. (I should probably paint the underside white, although you don't see it unless you're on the floor)
Here are a few other small closets that I find happy and inspiring:
crafting closets kids play area
vanity area in small closet closet with patterned wallpaper
tiny desk area
Let me know if you plan to do something cool with a closet of yours or send me pictures of finished projects!