art backgrounds cartoon characters children clip art clipart cute doodle graphic illustration kids pattern stick kids toddlers wallpaper whimsical arc arcs back background curve curves geometric geometrics graphics gray line lines shade shades shadows shape shapes splines sundfractals backdrop block blocks cloth color colors colour colours fabric hues patch patchwork quillt quilts series tints tones variations canvas grunge grungy paper papier rough rustic texture textures tone variation abstract paint painting pastel pastels spatter