I posted about my MTA New York City Arts for Transit poster. And now, they are also available as room rugs, in four different sizes according to your needs. They would make fun decoration for kids rooms.
For t(w)eens, how about giving good books? May I suggest Nahoko Uehashi’s Moribito series (book 1 & book 2)? Not just they have illustrated wrap around covers, they also have chapter opener illustrations. (you can see illustrations here and here). Also, Newbery Award winning author Margi Preus’ masterpiece Shadow On The Mountain, also with my wrap around cover, has just gotten published.
I read books I illustrate, and I can guarantee they are great books for young readers.