Are #39 and #40 exactly the same? Can't spot a difference. We definitely prefer the ones with the white around the outside. The paper airplane is still an excellent choice. Stronger colors was a wrong choice of words, maybe just other colors, less primal.
We like the green the best, but an orange could be interesting as well as a version where the "do" is a different color - maybe try black either for the "do" or the "hop". And a stronger, warmer green.