Well, it's friday, so as promised, here are the pieces. I haven't had time to make any new ones, just the drawings.
Maybe over the weekend I'll be able to.
I thought about the connection system, and I did this illustration. It also shows how to make the 90° curve.
I made a zip file of the 90, 180, and straight pieces, I'll post in a minute or so. As requested, I took out the big filled in areas, and replaced them with just lines so you can fill them with the paint bucket, or color them in with a marker, or paint them.