Thanks for the compliments!
I came up with it myself. I used MSpaint, zoomed into 800% and turned on the gridlines--you then have instant graph paper. I decided on the four colors and simply went across, "yellow, green, red, blue". The second row I did "green, yellow, blue, red". That's it.
I didn't cut and piece individual 3-inch squares, but used 7-inch that I would stitch down two sides, cut, turn, stitch, cut, and stitch again. . . . Make sense?! I saw a video online of a lady who did that to make "positive" and "negative" 9-squares. . . . I adapted to give me 2 4-squares.
Anywho--some of the lines don't mesh--but I believe it was someone on here that mention a galloping horse. . . :)