Use unsized rice paper for the crinkle. Double Shuen, Ma and Pi all work. You can also use Masa if you have it (Masa is good for a "crispier" look for rocks but regular rice paper will do as well.) Avoid very thin rice paper as you may break it during the process. Watercolors – Sumi-e ink, indigo (and shades of blue or purple if you like shading with a bluish tone), any green and brown tone for rocks (yellow ochre, raw umbra, burnt sienna, green tone; White Gouache (optional); Brushes – Old brushes of various sizes, have a small/fine one for branches and tree trunks; Small dishes for ink and colors, Hairdryer, Spray bottle, Paper towel, Water container; Felt (to protect your table).