It started when I was looking through screencaps to look at the sets of Supernatural. I প্রণয় doing this and do so often.
This is one of the many pictures that I saved:
The দেওয়াল of blocks can be seen throughout the episode.
Last year, when I was watching "Changing Channels" when it aired, having just recently seen the 3x14 picture, I recognized the blocks. :D
Here আপনি can see them from a different angle:
I spotted them recently at the beginning of "Point of No Return." This time they appear to be broken. Perhaps it is symbolic...
Update: [April 22, 2010]
Brief pretty block sighting outside The link Hotel in "Hammer of the Gods."
He may be our পছন্দ angel-turned-Winchester-sympathizer, among other things, but Supernatural's Castiel is also the master of the cute quip. His best lines, of course, were delivered when he wasn't even trying to be funny, and the clueless angel's meat suit looks even আরো hilarious as he quizzically wonders what he ব্যক্ত to make us laugh. There are a few one-liners that Cas tried to make out of his own volition that ended up making us chortle even if they weren't delivered as he intended.