The default PrestaShop install offers a neutral theme in shades of gray, enabling sellers to quickly and freely start their activity, whatever their business line.
Nearly a 1000 themes are available through the PrestaShop Addons marketplace (http://addons.prestashop.com/en/). They were created either by members of the PrestaShop community or the PrestaTeam, and are sold at reasonable prices – some are even free.
As a graphic designer/web developer, you too can put your themes up for sale on the PrestaShop Addons site, and earn 70% of the selling price.
Anyone with some knowledge of CSS and image manipulation can customize PrestaShop default theme. Assuming you know PHP as well, you can build a whole new theme for your shop – or for merchants who wish to use a customized theme. Thanks to a tried and tested theme system which uses the Smarty template engine (http://www.smarty.net/), any shop can quickly sport a theme tailored to its needs.
PrestaShop also offers a complete training program for designers. Contact us through this page: http://www.prestashop.com/en/training