Our latest K2 powered website is for a local wealth management firm. The site is a custom design on our in house template framework. There are a host of extensions and custom module for analytics, Flash Chart Pro integration, Constant Contact list subscriptions, and of course K2. We use several content types with custom templates for both items and module.
willingdonwealth.com

Congratulation " Brent Friar"
Fast, beautiful-colors, nice contents and designs.
Thank you for your share

Clean. Corporate. I don't know that I've got that in me. Good work.

The contact page even lives inside of K2. Thanks for sharing.

willingdonwealth.com/index.php?option=com_k2&view=item&layout=item&id=75&Itemid=9

No SEF?

Oops, thanks Fidel, I totally forgot to turn on SEF.

You've got it.