abstract appearance backdrop background close-up color colour Dirt drops feel garden garden pebbles gray grey pebble patch pebbles rain rain drops river rocks rocks rounded smooth smoothed surface surfaces textures varied shiny streaks veins design layout path patterns plants shapes stones colored colors coloured colours decorative striations tactile variations variety veined landscape landscaping paver pavers pebble rock sidewalk texture gardening geology piedra piedras river river bed stone garden-pebbles pebble-patch river-rocks shape shaped small surfaced surfacing textured thick thin