This is my own opinion about what I would do if I had all those rectangles, feel free to ignore me, because my opinion won't be popular.
Personally, I'm not a fan of rectangles. I'd rather cut them into usable pieces. However, nothing says you have to cut them all at once! One pattern that comes to mind is a jagged X quilt, you might be able to adapt your rectangles for use in this quilt by cutting them in half lengthwise.
https://www.youtube.com/watch?v=Ghg7aXt6qMc