watercolor quit layout. I'm working on one using 256 - 2" squares and half square triangle units. Fusible grid interfacing will make layout and sewing easier plus once you get it laid out the way you want it, fuse the squares to interfacing and you won't have to worry about something or someone rearranging your them.
To do this block in a micro mini quilt, you would want to simplify the block some. In this method you sew a half square triangle unit to measure 2 inches square including seam allowances. Then cut a 1-1/4 inch square of accent fabric. Lay it right sides together on background fabric triangle corner. Sew from small square corner to corner. Trim excess to 1/4 inch and press toward outer unit corner. Make 3 more of these units to complete a 3 inch block. Then make as many as desired for your small quilt.