summer poster in retro style. multicolored wavy pattern. abstract of sun rays. psychedelic bright for summer

summer poster sun retro wave festival starburst rainbow ray style pattern solstice multicolored traditional background effortless geometric shape abstract art circus oldfashioned template vector trippy wavy swirl bright border acid groovy vintage design funky radial psychedelic 1980s hippie 1960s 1970s boho checkerboard yellow red blue flower burst texture explosion