Titanium is really cool for a lot of reasons, but this Instructable by, ah, “Thursday” highlights one in particular: It is extremely easy to anodize, and produces really striking colors when anodized. So, you know, if you’re interested in anodizing this is an easy way to start experimenting. Thursday has stripped the anodizing process down to its absolute minimum here: small titanium bits, white vinegar, a stack of 9V batteries, and a counterelectrode. Now I want to see somebody use all those differently-colored rings to make a chain-mail photomosaic.

How-To: Anodize aluminum