Numerals 1-10 controls color to gray ratio. g (lowercase) controls colorful grout color. G (uppercase) controls grey tone grout color. Comma (,) and period (.) control spread of colors, Greater than (>) and less than (<) control spread of grey tones. k (lowercase) toggles between greyscale random and greyscale gradient. K (uppercase) cycles through randomness spread of greys. c (lowercase) toggles between color random and color gradient. C (uppercase) cycles through randomness of spread of color. r (lowercase) randomizes all of the variables. s (lowercase) saves a snapshot of everything.