Modeling Tip: Legos

I have a bucket of Lego bricks gifted to me by my mom and by folks with children no longer interested in them. I find them invaluable for insuring walls and floors are at perfect 90 degree angles. This is a tip I first heard for working with Hirst Arts Molds, which was reiterated by Sean K Reynolds at PaizoCon, which has now applied to my paper card modeling project as well. I'll be posting about Fat Dragon Games products in a few days, as a major project I've been working on is finally drawing to a close. I've decided that my work will be the basis for a whole new campaign! Ah, gamin' goodness!