While these are not much to look at with the naked eye, they sure are interesting up close. They look almost like a miniature lady bug, but with more interesting pied colors. I had a little trouble finding the species, until I googled "tiny beetle" in the images section, and then I saw many photos of this critter. They are 'carpet beetles', or 'varied carpet beetles,' Anthrenus verbasci.
Most of the references to this bug say that it eats natural fibers and is a pest that destroys carpet and and clothes, but come on, how much could this little guy eat? He is only about 1/8" (3mm) long. I hope he doesn't have a few thousand relatives nearby.