Update! My coloring book designs are now available on tshirts! They can still be colored using fabric markers or paints. They are being manufactured and sold by a local company, Desert Sage Graphics. There are four different designs available and the shirts are made from Organic Cotton. I have one for myself and it is very comfortable!
I have finished my very first coloring book! It is available in printed and PDF formats in my Etsy shop. There are ten designs in the book, see below to see all the designs. The printed version is $12 and the PDF version is $6.