I too have been playing around with the Summertime II Swap Blocks. I always start on my "design floor". I move the blocks around until I like the placement and have like blocks set apart from each other. (I added blocks from the 2012 Summertime Block Swap and last year's Summertime I Block Swap. And, a couple of UFO blocks that have been sitting around for way too long.) Then, I try to figure out the direction for the filler blocks. That's why I photograph along the way in case something needs to be moved or changed. That little Sun Bonnet Sue in the bottom left corner, my mother made years ago. I have about 30 of them. Enough to make the Granddaughters quilts from them. In any event, I am glad I have one for mine. I'm going to have her flying a kite. Which will be worked in as I go along.
This is the tentative layout that I came up with. Although, I have had to put them on hold for the moment while I participate in a couple of swaps.