background Bacteria texture creative design frame Grafic design lighting effect texture abyss bacteria bacterial depth Fractal fractals life magic magical mystic ocean science sundfractals wallpaper analyse backdrop blood blood analysis cells cleaning clusters concept contamination culture disease disinfect fungus germs graphic green health health care illness immune immune system immunity infection medicine microbes microscopic sample sickness slides swab tissue unclean virus abstract algae bacterium bog canal environment environmental fen goo gooey grunge grungy lake marsh mat nature plant poison poisonous pond scum Slime slimy stagnant swamp thick toxic water weed wet color colour medical pink probiotics system red blue