Here are four blocks that I made last night. My fabric is still packed and I found the box of solid kona cotton (and not any black), so these have a dark green background (which is OK according to the guidelines).
I thought that Hoffman Challenge fabric from a few years ago (lower right) makes pretty good fireworks.
My four blocks bring the total to 224 ... which is only three away from the number needed for 5 winners. I think I'm going to have some breakfast and make a few more blocks before the deadline.