Forest Quilting Master List FREE Patterns
I am not sure if this will link or not, but their website has lots of free patterns and ideas. Good luck, love the quilt top.
Welcome to the Quilting Board!
Going against everybody, I think I would quilt rectangles like the ones you have, only offset so they look like shadows. Transparencies are a great idea!
every cloud has a silver lining but sometimes it is hard to get to the mint
Can't help with the quilting but I just LOVE the colors in your quilt.
You can go to a hardware store of W-M and purchase some clear tablecloth plastic and draw on that. It is easy to erase and use over and over.
As you indicated that you want to do something in the vertical of the bars, have you considered doing a larger vertical and not quite so "viney" version of the vine and flowers that are in your border fabric?
Well, I took the plunge. Loaded the top last night, and started quilting after dinner today. I combined a bunch of your ideas, and came up with tall curvy spikes in the rectangles, outlining the black bars and border squares, and spirals in the 16-patch blocks. I couldn't make the tree/vine and flowers work out in a way I liked, so I had to pass on that. I hope it looks good when I'm done.