One of my most popular designs is my "DIY display viv for $100" (pictured below). This design can be built with nearly no experience and for about $100. It's perfect for corn snakes, kingsnakes, and other colubrids. It can easily be modified by using wider melamine shelves to accomodate ball pythons and other larger specimens. The plans are available for download by clicking the link on the right. Feel free to distribute them or even link to them from your site; I only ask that you credit me with the design.
I also recently designed a new rack pictured below. Instructions are available for download on the right.