I use Oxygen:
http://www.judithbillig.com
It is a free theme.
However, I've bought the add-on and customized it, because I have apparently nothing else to do
Even without customization, I still love the clean & sharp look.
If you want to have a look more like a photo blog, search the themes for "portfolio" or for "photos".
That brings up lots of free themes purpose build for displaying photos easily.