Here's the first official Adventure Time press art. The press release (which misspells Seibert's name) says:
Adventure Time with Finn and Jake: Finn, the human boy with the awesome hat, and Jake, the wise dog, are close friends and partners in strange adventures in the land of Ooo. The 30-minute series is from Cartoon Network Studios, created by Pendleton Ward and executive produced by Fred Siebert and Derek Drymon.High-res image here, and the Flickr gallery includes lots of Adventure Time storyboards and concept art. I particularly like the vampire bat.
*Previously: Adventure Time/Mike Tyson's Punch-Out Mashup.
*Buy Adult Swim dvds at eBay.