There are quite a few of people on here that do......... here's my thread....
My sketch card thread, major mojo.
(thanks for the reminder to update it)
Most use different mediums and styles and vary in quality, so you need to find what you like and don't.
There is also Qwasian, the guy posted in the thread above and more (I just don't remember them off the top of my head, but can get you more names if needed)