Color Wheel block

Here's the first block of the Color Wheel Quilt.  Definitely a learning "curve" with this, hopefully I will improve as I go along.  There are 12 wheels in the quilt, for a 64"x64" finish.  The pattern called for different "low volume" backgrounds but I don't have that, so good ole Kona gray is my backup choice.  For the colors, I had a pack of rectangles 2.5"x5" that were popular a few years ago, plus I have been buying charm squares from the Missouri Quilt Company, their "daily Deals" and don't think I need any more deals!  In fact I'll be looking for patterns using the 5" squares...