We've discussed "sock subscriptions" before... also known as a kind of "sock of the month club"...
Here's another one!
Sock Club
http://www.sotmclub.com
This one's a little different. The previous ones focused on delivering black socks every month (for the usual business market).
This one will deliver you a completely different wild and wacky pair of socks every month!
http://www.sotmclub.com/gallery
There's often a way to take an existing idea - and give it a kind of "twist" to target a different market (which is what has happened here)...
If you want to read about some other product subscription ideas, try these posts (and their associated threads)...
http://www.sowpub.com/forum/showthread.php?p=7033
http://www.sowpub.com/forum/showthread.php?p=19708
http://www.sowpub.com/forum/showthread.php?p=19892
Best wishes,
Dien