Why didn't I think of this? Pick the size & fabric -- DIY Memory Foam Rug via the idea room, love this! Another note - memory foam rugs are beneficial to those of us who have brain injuries - no tripping and falling!
DIY: Kitchen Mat Tutorial - this is made from kids' foam play mats - tutorial lists paint used to do this project. Need something like this for my concrete floor in the kitchen. even though I hate area rugs.