The design should be inviting, clean and crisp. Aim for a simple, modern look and avoid anything overly futuristic, retro or corporate (no glowing neon, please)
Smart and Fun is the goal. You might take some inspiration from flat design or the Metro UI (but not too much - I find it interesting, but not interesting enough to copy it wholesale).
Most prominent should be the list of products.
The following are suggestions, however, nice layouts that violate these guidelines are welcome.
* Suggested Colors - I prefer a site that looks light and open. Note that many of the product images are JPEGs with a solid white background. Avoid red as a main color, but it can be used for accents or buttons.
* Size - Preferred maximum width 1020px for the content area (wider backgrounds are fine).
* Fonts - Choose a font stack that is easily available. Prefer built-in fonts, Google Web Fonts or Typekit.
* Illustration/Photography - Illustration or the use of patterned backgrounds is welcome, but not required. Photography should be avoided because the website will already be full of product photos.
* Layout - A 2, 3, or 4-column grid as seen on the demo site is acceptable, however, I'm very interested in ideas that are more visually exciting and that violate the grid concept to give more focus/prominence to certain items. That said, any alternative layout should still maintain the core "list of products" idea.
* Photo Size / Content Size - Product images on the demo site are 300px wide and vertically centered. You can also go bigger or smaller, keep everything equally sized, or mix it up with different sizes. The maximum available image width is 500px. It's possible the site will include video or larger media for certain products in the future.
* Name / Logo - Go extremely simple here. The name might be changing soon, so I'm waiting until later to get serious about logo design.