Gateaux... But have you seen some of the awesome cake toys she offers over at Evil Cake Genius?
They make some of the most awesome stencils I have ever seen! They are a little expensive, but they are really nice! Some are standard stencils, but some are printed on a ribbon type material and works a lot like a silk screen. I haven't tried the silk screen types yet, but I used the Skyscraper Windows stencil to make this birthday cake for a huge fan of the Caped Crusader.
Everything else on this cake is either buttercream or modeling chocolate. Speaking of modeling chocolate, you guys know that I love the stuff, but lately I have been having some pretty fierce condensation issues with my modeling chocolate. Anybody else experience this? If so, let's talk through it in the comments!