I didn't like the themes, but I bought Pic Pack 1, and it's ok. I wanted the British and American Symbols, but instead I got some Soviet and Axis symbols and planes, a couple of pilot headshots too. I need to get some more MS points to buy pack 3...
EDIT: here's my gamercard, I have one of the pictures from pack 1 up right now, so you can see if you like it:
