A couple people asked - the pattern I'm using for the diamond quilt is this one by Fig Tree Quilts.
I have several of her patterns, and you can count on all kinds of great construction tips throughout the whole process.
One thing she didn't suggest, that I would highly recommend, is the 60 degree ruler. I happened to have one already, and it has made things much easier to cut the center diamonds and then to keep each color round perfect.
Here's a portion of the fabric pairs I had covering several chairs in my sewing area. I'm making the diamonds with white on the outside first, and I need 21 of them.
I spent one long evening shifting pairs of strips and diamonds around - standing back to look at them - shifting some more - until I had settled on 24 pairs. I'm not 100% sure about a few and I have enough fabric to make extras to decide on at the final layout.
I took several photos of the pairs on chairs before going to bed, just in case they were tossed about by a kid! They're now held safely, as they await their turn for sewing, by a serving tray - with strict instructions that nobody is to touch it!