A few months ago, I bought a sketch card featuring the Thing by the legendary Fred Hembeck; it currently adorns my bookshelf, leaning back near C.S. Lewis's The Screwtape Letters. Sometimes I find that I have to stop myself from heading over to eBay and spending a crapload of money on all of the other great cards they have up for auction, because let's face it - I already spend too much on comics every month to justify TOO many more hobbies.
Sketch cards seem to be pretty popular right now - they're small enough that an artist can churn a good number of them out and make some quick cash, while others can afford to buy them as opposed to full pages of original comic book artwork, which can go for several hundred or even thousands of dollars, depending on the artist and characters involved (every once in a while I see early Fantastic Four artwork from Jack Kirby and Joe Sinnott, and I just about die).
It goes without saying that I hope Teddy and the Yeti one day garner enough fame to warrant sketch cards of their own - though that's not too far of a stretch as I've seen some rather obscure characters on cards. If there are any artists reading this post, know that if you'd draw one of those two characters on a card and place it up on eBay, it'd be almost the same thing as reaching into my pocket and taking my wallet...because I think I'd pay stupid amounts of money to make sure I got it.