There were also quite a few other designs like this:
These babies don't come cheap, but I just couldn't resist them. So after a few days of tossing and turning in bed, I finally went to get myself a set (first photo). Okay, there goes my last frivolous purchase of the year. hehe.
Oh, and these are versatile as well. You don't have to use them only as ref magnets. As one contributor to Apartment Therapy shared, her household actually uses the magnets as small paperweights. Coolness.