There are a lot of really simple colorings on Coloringpagez.com, but this rock coloring page is probably one of the simplest on the open spaces of our site.
Rock are most often very neutral colors, such as gray or light brown. But there are more unusual rocks, such as pure black or bright red.
But besides the rock in this coloring, you can also see some ground and grass, which should also be painted using dark brown and green colors. Shadows and highlights will make the final result more voluminous and three-dimensional.