MarketPress & SimpleMarket & other themes

Hey there. I am working on a client e-commerce project and I believe we will go with MarketPress. My client also wants custom colors and background images on at least the front page and possibly throughout (though he is not too picky). Do you recommend using SimpleMarket or FrameMarket to handle this, or is there another modular theme that I can more easily manipulate, without coding, to accomplish the aesthetic goals? I am a developer who has experience developing sites, but admittedly I am not hot at CSS, so I try to use themes that have a WYSIWG editor or can be customized from within WP. Advice is welcome.