abstract appearance background blue color colored colors colour coloured colours inside interior internal Rendered rendering rough surface surfaced surfaces surfacing tactile texture textured textures uneven wall wallpaper angled artificial blanket diagonal diagonally diagonals picnic picnic-blanket ribbed ribbing rubber rubberised rubberized underside variations varied various waterproof cold coloration cool gaps icy layer outline outlined outlines partial slippery smooth thick thin cloth fabric green light lighting nap pilling woollen-cloth growth hail hailstones ice path pathway pavestones paving scattered scattering shapes Sizes water weeds wet white external fired glazed glazing hard layered layers lumps lumpy molten pottery