I am a huge fan of working with acrylics – it is an extremely forgiving medium that can be easily cleaned up with water. When I’m feeling creative, I back out the car & lay down one of the large sheets of cardboard I keep folded up next to the cabinets. When it comes time to finish a piece, I have a pile of wooden blocks to float the piece and allow for run-off.
To keep things more functional, I converted a cabinet into a great workspace by adding IKEA pegboards with plenty of room to expand.