Yarns: I have used 14 colors of Rowan handknit cotton and 8 colors of Drops Paris for the circles. White edging is Drops Paris. I used a 4,5mm hook.
Pattern: The first three rounds are worked same as the first three in Lucy's Hexagons. The fourth round is simply clusters of 3dc, 1 ch. The circles are made into squares with hdc's (clusters of 3, 1ch) and corners are 3dc, 2cd, 3dc.
Edging: I did 7 rounds of 3dc clusters and then 2 rounds in sc. The final round is mini shell stitch edging from Crochet with Raymond. I really love the lacey feeling of the edging and how it frames the whole fireworks of colorful circles in the middle.
I am so happy with the result!