Snow White key caps produced by Loungefly, circa 2011. Made of rubber, they'll fit most standard sized keys. Officially licensed by Disney. In the first example, Snow and the apple are pictured on the front with the text logo on the reverse side.
The key caps were sold on individual card backings. In another version, we get Snow White's head sans the apple background.
Disney has released numerous character key caps of their own including a Grumpy and Dopey.