I have seen people mount this to use with sets like the letters:

http://www.ikea.com/us/en/catalog/products/30159442/

We have them as well (on our fridge) and they are played with daily by DS, 11 months, who eats everything. He cannot fit a whole letter into his mouth although we do have a version that is two years old.

They also stick to our washer and dryer, FWIW!