My favourite category of bicycle is Monstercross. The basic concept is to take a cyclocross bike and stuff the largest tire you can onto it. Put on large volume knobby tires running at low pressure. Road bike speed with off road capabilities and loads of fun.
One of the most beautiful Monstercross bikes I've seen was a bike from Shamrock Cycles. It was their entry for the 2010 North American Handmade Bicycle Show.
This bike looks all business with the 29er tires.
Here is the Shamrock Cycles NAHBS 2011 entry. Another beauty.
Every once in a while I see a custom bike and I think to myself: "That's the way I would build them." That is the case with these Shamrock Cycles Monstercross bikes. Good luck at the show Tim and thanks for allowing me to post photos of your bikes.