Easy Pinwheel Quilt

I have a pinwheel quilt I started a few years ago. It's not yet finished! Haha. I lost steam while making it and now I'm trying to figure out how to finish it. Before diving back into it I decided to research on an easier way to make pinwheel quilts. 

To force me to learn the technique I decided to make a lap quilt. I originally designed it to be half-squares in four colors, but decided last minute to make pinwheels. The first step was to make a gazillion half-squares. I worked on it for a few days (how to here). And this week I started sewing them up to become pinwheels. 

Here's how I've been making them quickly -

I made a gazillion half-squares. I'll probably be able to make four lap quilts out of this project. I'll post soon how I'll put the whole project together!