I thought I saw a thread here on QB about different sized blocks that gave a link to a really nice one, but can't find now. I did find a blog that once a month showed a quilt made with orphan blocks that starts here
http://rosemaryyoungs.blogspot.com/2014/05/ Then there is a flicker page with some have shown theirs linked to
https://www.flickr.com/groups/2659397@N23/pool/
I also found these here on QB
Santa block swap ( signup closes July 15, 2010)
Sampler Quilt made from different size blocks