Designing within the constraints of a store front (notably Marketworks and Channeladvisor in the UK) can be tricky, but some designers don’t let anything get in their way:
http://www.cybercheckout.co.uk/ is a channeladvisor store designed by Sell-it-smart who have made this table based basic store look and feel like a real website.
More examples are Grapevinehill who have used a splash page integration to make sure their store front looks and feels like a real website. Hagchairs uses a similar method.
Can’t should never be in a development or design firms mentality, as you can have fantastic websites using store front systems if you try and push the boat out.
On further digging I also found Junction Quest who also manage ChannelAdvisor Store Design and the site Exclusively Home designed by Rick Wells Ltd.
