There are SO many sources for free sampler quilts.
If you get the opportunity to buy Judy Hopkins' "501 Rotary Cut Quilt Blocks", get it!! It has 501 blocks, but even better, it tells you exactly how to cut each block in various sizes - ranging from 4" up to 12" (and even a few larger than 12").
I'm actually working on a sampler quilt right now and I've picked out the various blocks from that very book. My blocks are 9".
And I started the Moda Shuffle blocks last year... then (as usual), ADD kicked in, and that is now a UFO.... which reminds me that I need to pull that for the UFO challenge.