It changes often. I really have fun getting things that my Braedon is into so that when I enjoy the FluffyMail when it arrives, he does too. It makes me happy to see him smile over fluff, LOL. I feel like Ive made his day buying him special diapers.
So, We've done
Monkeys
Dogs
Wild Animals
and his new thing now is Trains and Trucks (Cuck-Bee Bee, Tain-Too Too), so Ill be on the lookout for trains and trucks, I guess.
I DO NOT do character themes, thats one thing I refuse!

ETA: Oops, for her I like girly things, anything pink will catch my eye since Ive had a boy for so long, I am really digging the pink since Ive been dressing and diapering a boy for so long, although I put pink girly things on him plenty, but this is different.

Once she can express what she enjoys though, Ill get her diapers based on her likes as well, thats fun for me!
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