MarketPress - Integrating with themes


I know MarketPress has it's own built-in CSS so that it can work with most of themes well, but this isn't exactly like that.

You know there are many attractive themes created for different WP Plugins and that's cause many users to choose other plugins, no matter if they are worse than MarketPress or not - many of them prefers to have better theme and worse functionality. Actually, I am not this kind of one, but I really like those themes (for example themes) and need basic rules and suggestions to learn how to integrate those themes with MarketPress.

Thank you,