You know the expression. "Humping like rabbits," I believe, is the preferred nomenclature, hmmm . . . ?
Whatever version of the expression is your fave, there's something a little charming about the USB Humping Bunnies ($15).
The USB Humping Dog sort of creeps me out, but these bunnies? I don't know, even though it's the same concept, they're kind of adorable.
Plus, it's a good metaphor for being productive, which is a feeling you do want in your workspace!