I started by going through my flickr albums and tagging anything I was considering with the tag "print" - this will let me then look at all those photos together.
Of course it was like a billion too many pictures, so I started adding tags, like wood, fire, water, nature, landscape, beer, stone, train, transit, bike, flower ... you get the idea. Then I can look at all the pics that are grouped by a particular tag. You can click each group below to see a bigger screenshot.
Tag = art
Tag = graffiti
Tag = landscape
Tag = red
It's been fun! I don't think I'm a LOT closer to picking what I print, but maybe I really am.