After several failed attempts to build an anodizer, I went low tech and came out a winner. This titanium ring was created with several 9v batteries and Coke. Colas have phosphoric acid in them which is the ideal electrolyte for anodizing. Miracle-Gro also works well. It has Ammonium Phosphate as the primary ingredient.
Check out my blog post in NYC Resistor for more details if you want to try anodizing too.