The example logo, is just an image. Your logo image can be whatever colors you desire.

As far as the background colors, you do have the ability to modify it, and Market also comes with a bunch of built-in ready-made color schemes you can choose from in the settings area.

Or, you can even modify the stylesheet to customize things further.

Actually, the it has about 20 schemes, plus the ability to customize on your own if you prefer.

You can see them in the demo. In the Market Theme menu tab choose "settings" and then scroll down to the layout and Design area. You'll see a dropdown box that says "custom stylesheet". You can choose from a bunch of pre-made color schemes. Just change it and click the "Activate changes" button at the top or bottom of the page. Or, if you choose "no custom stylesheet", then you can select color options for a few different page areas.

In addition to that, you can also create your own new custom styles, and put them in the "custom-styles" folder of the Market Theme files. If you put a new style there (created according to the instruction file in that folder), then they'll show up in the dropdown box.

No, it's not.

There are over 20 built-in color schemes you can choose from, or you can edit any of them by altering their stylesheet.