Free WordPress Photography Themes
what is a good wordpress template/theme for selling photography and art prints?
preferably free and with as little plugin integration required as possible.. 
I have not heard of this for word press, but I have for Joomla, Mambo and OS commerce.
More to the point Gallery offers a image display and shop option which is what you would need and its simple to use.
You can find Joomola here: http://www.joomla.org/
You then add a gallery http://extensions.joomla.org/search?q=gallery
then add a cart: http://extensions.joomla.org/extensions/e-commerce
then tag the pages with the info and cart button.
If you use virtual-mart you will and can use this plug-in
http://extensions.joomla.org/extensions/extension-specific/virtuemart-extensions/virtuemart-products-display/9910?qh=YToyOntpOjA7czo1OiJpbWFnZSI7aToxO3M6NToic2FsZXMiO30%3D
Mambo is much the same.
http://www.mamboserver.com/
You get the add-ons from here: http://www.siteground.com/mambo_addons.htm
[affmage source="clickbank" 3="10"]KEYWORDS[/affmage]
We developed a shop using PHP and buttons which had each individual option for selling products, the person clicks on the button and then has a simple cart where they select media and pay.. simple really.
you can also use OS commerce.
You can get that here: http://www.oscommerce.com/
Download your fav payment mod from here: http://addons.oscommerce.com/category/Payment_Modules
Download image display from here: http://addons.oscommerce.com/category/Images
The correctly designed image selling and display website is Gallery2, you can download this here:
http://gallery.menalto.com/
Gallery 3 is nicer IMO, and you do get a choice of where to print sell images and the prices. this means that you need to set up accounts with the correct printer, such as photobox and set the pricing that you want, there are a few others. needless to say you just google the stuff you want and install it as there are always guides.
Modularity Lite: WordPress Theme Review