The two main characters from Pull Down Heaven, Linan the tiger and Jeckle the rat, are now available in stylized, super-cute t-shirt form!
The design by the wonderful *TastesLikeAnya
You can find it at either of her online shops here:[link]
I actually just got mine in the mail from Society6 the other day, and I am quite impressed with the quality and speed of delivery. Can't vouch for redbubble yet, but I'm thinking of giving them a try (plus, they have stickers; awesome!)
And if rat and tiger aren't to your liking, she has plenty of other cute designs as well!