I've been working on four abstract paintings, all 10" x 48" with a similar theme. Two of the paintings are mostly shades of blue, and these last two are in shades of green, cobalt green, and aqua. Here's the progress I've made so far on the last in the series:
After painting the background, I drew circles in cobalt green. After the lines dried, I filled them in with shades of green, starting with a light emerald green in the center and working my way out to the darker, cobalt green.