Courtesy of Danny Choo...

"Moji" [文字] meaning "character" and "Bakeru" [化ける] meaning "to change into."

Little kanji toy puzzles that can be transform into their corresponding animal counterparts. They have fish, horse, dog, tiger, bird and dragon - only 6... So maybe not the most useful learning resource, but very clever:

http://www.dannychoo.com/post/en/25596/Mojibakeru.html

http://www.bandai.co.jp/candy/products/2010/589514.html

That's actually really neat. I love Danny Choo's style of humor when he posts this kind of stuff

Unfortunately for me, animal kanji seem to be some of the easiest kanji for me to remember, so these wouldn't be too great for me. Although I'd probably never get bored playing with them, lol.