I’ve updated the licensing for the Cloud Clothes designs. I make them available “CC-BY” as per the wordle creator, Jonathan Feinberg. I let go of the GPL licensing because I’m told that wordle is “fair use” of copyrighted material. Furthermore GPL and CC-BY seem to me to have the same intent of preventing anyone downstream of claiming exclusive rights.
The designs are available for download from these two pages: Calculus and WP_Code_Cloud.  The shirts are once again available at www.cloudclothes.com