Hello,
we have recently completed an ecommerce project created for an italian company that sells welding and cutting products worldwide and only on B2B market: Leonerusso.com.
So we created an essential interface enhanced by a stylish graphic menu of the main categories.
Because of the particular field we're dealing with, most of the customization is related to managing products of different kinds: we had to deal with different measurements and take the into account for price calculation, and shipping parameters.
If you want to take a look here's also the english version of the website.
Let me know what you think!