I love using these mini design boards! I posted about them previously here.
They really make it easy to lay out and stitch a whole stack of blocks efficiently without getting the pieces out of order.
I love using them so much that I made a whole stack of smaller ones (10x10") as well as some more of the 15x15" size.
Note - I skipped the edging step; I found that it was pretty time consuming, especially if you're making a whole pile. Also, I found that using a colored or patterned binding could be a bit distracting for me when it came to the design of the block. Basically, I should just admit that I was too lazy for that step! However, just to assure you - they work perfectly fine without the edging. :)
Thanks, Lori Holt, for introducing these to the quilt world!!