Unless I'm missing something, walls can be different colours or designs but floors and ceilings can only be painted in blocks. It would be nice to able to match floors and ceilings with walls. Carpet and wood paneling in the same house is a radical idea I know but boy oh boy wouldn't it be swell.
*edit* I hope people don't misinterpret my last sentence as being sarcastic. I can see how people might see it that way but it was meant to be light-hearted.