Here’s an example of some of the white labelling partner work I used to do at Fool.co.uk. At one time I skinned credit cards, savings, current accounts and loans centres for most of the big personal finance sites (Confused, Compare The Market, Go Compare, 77Finance, The Idol & Virgin Money).
The white labelling of a site involved making content and styling changes to xml/xslt pages. Using global css styles and asp.net master pages the task became a lot more manageable. I also produced an array of button template .psd files to help quickly get a site up to speed. Smaller mini tables were also sometimes designed and placed on other sites such as Sky’s money pages.