I Need Your Opinions! :D

I'd draw the Deathly Hallows sign onto the back and I'd write something funny in connection with your fav character. Like, if you like Sirius, you could go after the usual ícone text: Sirius Black - escaped Azkaban, evaded dementors, outwitted ministry killed por drapery.
Same for Dumbledore: Alas, earwax! / One can never have enough socks!
That even fits, as Dumby was so into the Hallows. Bet he kept his wand in a woolen sock, like Harry the Sneakoskope.

Oh, goodness. My friends and I are doing the same thing for the new movie :]

One thing that you can do is either write 'DEATHLY HALLOWS' or something of that accord on the front and then your favorito character/quote on the back from the book