A while ago, a friend on Pinterest posted a link to a blog titled Lego Quest, with a weekly Lego challenge, one per week for a year. The official Quest is already over, but people can still use the ideas for inspiration. I gave my boys the first "challenge" a couple weeks ago and G has been on my case to post the pictures as promised, so I'm finally doing it (and he is reading over my shoulder as I type this-- Hi G).
The challenge was "build a car." Here are the pictures of the boys' creations:
Z calls his creation "Super Gabe Kart."
Link to the original Lego Quest: http://legoquestkids.blogspot.com/2010_01_01_archive.html