. . . You do your squares and build from there. . .
I have done a little of this. I am planning a baby quilt right now, I do the embroidery first (I use an oversized background so that I can crop as needed). These will be done is bright colors and will be the center of stars where the points will be done in brights.
Very beautiful. I like the embroidery and the colors you chose...
Here are four blocks that I did for a row robin this past year