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!
Brightly painted frames, cardboard letters and loud scrapbook paper. (or, wooden frames, cardboard letters and muted scrapbook paper, which is what I was actually planning to do on the nursery wall once the baby comes and I know initials!