Martha says she used a huck lace pattern, and just randomly chose colors to put in certain places. This is what Martha says, "Finished my summer rainbow inspired huck towels... I enjoy weaving huck and loved the random color changes in each towel. I wove the towels with no particular color sequence in mind, think they turned out well... This up close picture allows you to actually see how pretty huck weave truly is."
And I think she's right! I want to try this towel pattern myself. Martha, thanks for the inspiration!