Hexagons are addicting! I'm working on a scrappy GFG quilt also. It's not a project I get to work on often, as I do it when I'm sitting. Which I rarely do! Always working on other things. Actually took it to the tire shop in town when I had my winter tires changed out! Got to work on the hexies for a few hours!! I have 20 flowers done and this year 3 that I've been working on it! Using the 1" hexagon template pieces from
www.paperpieces.com, which I really like. Not sure how I am going to put the quilt together, but I'm a long way from that decision. I purchased a digital edition book called "Quilts from Grandmother's Garden" by Jaynette Huff from the Martingale.com website. It has wonderful ideas for quilts.
Would love to see your end product. Like your 16 patch idea.