I went through my pile of scraps, searching for a starting point. I roughly sorted into sizes. What emerged was this collection of pieces with straight cut sides and square corners. This is an excellent place to start improvisation lessons.
These units are matched to accommodate the selvedge that needs to be cut off after sewing.
I think these units are a nice fit and they'd look good together.
I've lined up this unit with a straight line to show you the curved bottom edge.
Tomorrow I'll show you how to work with weirdly shaped pieces.