I used a square plastic pot that I have. The relief design is in the inside as well.
Keeping a look out for other cheap pots that have the same. Need to do a negative mold
to have design on outside of Papercrete pot.
Rick
"Many times a day I realize how much my own outer and inner life is built upon the labors of my fellow men, both living and dead, and how earnestly I must exert myself in order to give in return as much as I received"