I was rooting through my sewing notions the other day and spied this little fella. He's a sewing & knitting gauge, but I found it's nifty tool for glitter house making. The blue gizmo slides up and down, so in addition to using it to measure, it acts like a mini t-square for cutting. You can find them in the sewing notions area of stores like Hobby Lobby and JoAnn's, as well as any store that sells sewing supplies. Cheap, too! With a coupon, maybe close to $1.00.

Great idea! That tool would save me a few minutes.