They have actually been around for quite awhile, since about 1932 when the Nelson Knitting Company of Rockford, Illinois, added the red heel to their socks.
Anyway, a couple of years ago I made a quilt with sock monkey fabric (although apparently I only thought it was cute enough to take a picture of one corner...)
But this is the cutest little sock monkey I've ever seen, and he can jump on my bed anytime he feels like it!