I used several unused sample pots of paint (there are actually three different coloured walls in the laundry) and some gorgeous wrapping paper cut outs. There was a floral pattern on the tiles around the sink which I didn't like, so I painted over them too. A bit of dodgy art and there you have it! Doesn't matter if it doesn't last - it is just temporary fun.
Instead of bats in my belfry, I now have 'owls' in my laundry (the wrapping paper I cut up was so cute, I couldn't resist).