I didn't read all the reponses but here is my idea ....
"Boys Will Be Boys" "All Around Boy"
elements:
dirt, bat, ball, trading cards {my 8 yo is into Pokemon}, bike, scooter, trucks, matchbox cars, little boys with spike haircuts, bubbles, stars, some stitching, backpack, frisbee, football, skateboard, fishing rod...etc....
some boy wordart
I thought a bunch of random stuff would make it a fun all around boy kit!