I made a tactile memory board using my daughter's favorite dinosaur toys, a picture frame, ceramic clay, plaster and watercolors. The main idea of this video is that you can use regular ceramic clay as a mold, being able to press any number of shapes into it and be amased by the incredible fine details it can retain. The other great thing about this method is that you can use the favorite toys of your baby without actually taking them away from your baby (for more then a few minutes)
More info: youtube.com