Hey there. Here are your options.
1. Polished, we can then engrave with black image.
2. Black anodized, then image is off white-ish.
3&4. Color anodized-Red & Blue are standard options, with images in white-ish.
When we anodize colors (black included), we like to polish the cap first. It gives the color a real pop, very 'candy apple' looking. I am waiting on anodizer to get me some caps, but they are off this week. I'll post some shots of different samples. As far as images, pretty much anything goes.
A bmp or jpg file works awesome, as does an eps for special graphics. We can however do custom artwork if you don't have any.
The red & blue ano is an upcharge, not sure what it will be, as will be a small upcharge for custom artwork. I'd really like to see the Solstice/Sky guys get first shot at the custom work as they have been there for us with the cup holders. Then the idea is to hit the rest of the GM market(Camaro, G6, etc.) with the caps as they look like they are the same across the board. The Kappaperf guys will reap the discounted graphic work, as the rest of the market may see an increase in price by about 20$. We'll see how that goes. Ebay uncovers alot.
The pic attached is a sample of black anodized with white-ish writing. This piece is like 8-10 inches tall.