In addition to posters and t-shirts, The Bad Lab makes a couple of fun, designy wallpapers, Sellvetica and This & That (my personal favorite).
You might also enjoy:
Fun Desktop Wallpaper Resources 
Rumplo About Courtney
Courtney is the founder of Design Work Life and Seamless Creative, a small design studio she runs with her husband Brian. She now splits her time between developing brand identities for small businesses and soaking up (and passing along) as much inspiration as she can.
christina says:
andrea says: