great idea, but it seems like you're making everything look very "stock". i suppose if you want your startup to look like another "web 2.0" company, then great, but I'd like to see some examples of how you took a personalized brand and turned it into something exceptional.
you're also charging way too much, and i hope your ad copy is just placeholder. i spend a lot of time on the internet laughing at LOL Cats (i admit it), but you can really do better than to name your pricing tier "I can haz design". evne for a proof of concept, maybe aim for a bit of professionalism.
i feel like the 3-option pricing tier image is really overdone (guilty of this myself) and you can easily find a more creative way to display, well...your creativity.
in all, i love the IDEA but the implementation is lackluster. you provide an easy way to get a cookie cutter image, which works for some people, but serious startup can afford to pay for a unique design. cheapskates like me can just spend an afternoon in photoshop mocking up the same things that you're offering for well under $400.
keep at it, and keep honing your design chops, because the core idea is sound.