retro psychedelic hippie posters with trippy mushrooms and fluid acid background. 70s abstract covers with crazy fungus

psychedelic retro mushroom ufo hippie set weird crazy alien trippy duotone 70s bright universe space floating skull mushrooms art illustration poster neon character fantasy 1970s fun mouth graphic background drug magic design cosmos rainbow cosmic eye colorful esoteric fantastic abstract pop cartoon template cover acid vector card mascot trip wavy