I have lots of rulers. Many I bought for a class. One I bought was Creative Grids Scrap Crazy block ruler. It is a lot of fun and perfect for scrap pieces.
It comes in five, four, or three sets pieces.
I have the four piece set called crazy six for some reason. There are a couple books of patterns for it.
Always Free shipping on creative grids rulers at Quilt in a Day
https://www.creativegridsusa.com/products/CGRMT6