I got Grom a free subscription to Lego Club Jr magazine. Everytime it comes, it sets off a session of lego enthusiasm. The magazine has a section where they have photos of kids and their creations. Here are Grom's last 2 submissions.
Grom's rocket ship
Dred Pirate Grom's Pirate Ship
I don't know if he'll ever make it into the magazine, but he's sure having fun trying.