(The colors are usually brighter than depicted here... more like the one below)
I also like this one, simply entitled Farbstudie.
Some people might find these to be too bold, too visually chaotic to hang in their own homes, but I wouldn't think twice about putting this up in my house (just not in my bedroom, which I prefer to keep more calm and monochromatic-ish) (I know that's not a word. Oh, well).
What do you think? What are your favorite paintings/artists? What kind of art do you put up in your house?