Not hand-dyed--just bought where ever I could find brights.
OK--this is how these were made. I found a site that had hexies lined up in a way that when you tried to cut them out they had enough space that you could use a rotary cutter. Then, because they did not have 1/2" size I printed off the 1" size, ran it through my scanner and printed it at 50%. This gave me just less than half-inch.
I then printed it on DecorBond(bought at JoAnn Fabrics). Cut them out and ironed them on the back of the fabric. I tried doing it using Ricky Tims' stable stuff and glue and wasn't happy with the results. Anyway, with the hexies on the back of the fabric, I could just stitch along the DecorBond to stitch them together.
Then when I pressed them, usually after I had the unit pieced, I pressed the center one with the edges flat and then press around the center one to press them to one side. They pretty much want to do this. A little spritz of water, press and put a ruler on them until the piece was cooled and it was nice and flat. Any other questions--let me know. I will try to remember to get a picture of the front tomorrow morning. Eli's coming to visit grandma tomorrow afternoon for a couple of days so it will have to be in the morning.