I have seen this technique on a lot of blogs and I have read a lot of reviews about this project. My first concern would be the comments about the toxicity of the ink. I search on the Sharpie website and found the pens to be a "Quick-drying ink AP certified nontoxic formula". First hurdle accomplished. The next concern I had was the ink washing off. I don't have a tried and true solution for this. I would recommend against putting it in the dishwasher. But other than that, I think it is a grand project and one worth trying. As I said, there were a lot of sites with instructions but the one I found first was at The Sweetest Occasion [link].