We wetfold a simple basis to make an animal portrait. This is more about proper shaping than about difficult folds. Very thick paper - elephant hide would work, but thick water-colour paper is better. I will probably use a 30cm (12 inches) square myself (at 400g/sqm) but 20cm (8 inches) is still ok. Bring a spray if you can. 10-inch elephant hide paper will be provided for the class.