How to Make a TV Aquarium
Have you discovered a dinosaur of a TV set in your attic? It sure can't compete with today's flat-panel units, but it doesn't have to head straight for the junk pile -- if you're creative. Here's how to make it do something those plasmas will never pull off: turn it into a fish tank.
Check out this WikiHow!
How to Make a Macquarium!
So you want to build your very own Macquarium (or mac aquarium as some call it.) I like to say that I have the most detailed instructions and construction tips on macquarium building on the internet. My guide comes complete with photos and links to recommended supplies.
Check out this page at UnlikelyMoose.com
DIY Custom Glass Aquarium
This mediocre page explains how to choose the right materials and everything you'll need for the design and building phases of your new custom aquarium. There are other resources online about this I'm sure, but I had trouble finding them to post. If this is your first cusotm aquarium, you may be better using acryllic instead of glass for your aquarium.
An About.com Page