Looking for a new backpack?

i'm really into rock, and i love backpacks that have guitars/skulls on it. i'm in the 10th grade, so whatever you do don't post all that kiddie junk. i like the ies brand, but i can't find any 'rock' backpacks. any advice where i could find them? i already looked at hottopic, journeys, pacsun, spencers and even searched it in google but i can't find any. it would really help if the main color was black. well please tell me if you know where i can find one! thanks!