I found zen simply be deciding to only obtain cards that are (in my opinion) truly beautiful or at least very striking. Must have great centering (and usually great color) to boost that. So: swell to look at or even display, in rotation, with no relation to value. If obtained at "fair" price then it's all good. But aesthetics are the key.
Example below just obtained. Not a great or famous card, maybe not even a true beauty, but very cool. Or check out my new site displaying a few:
http://bit.ly/VVImP9
http://www.net54baseball.com/attachm...1&d=1362178284