As spotted by Steve Burge at joomla.org , IKEA uses Joomla! and VirtueMart to power his Kuwait and Saudi Arabia websites.
Just take a look at how flexible is VirtueMart about templating issues.
This is the kithcen page at ikea.com.kw , an example of custom theme for the browse page
While under here we can see the customized flypage
(Just click on the images to get on the live website)