geometric backgrounds. blue abstract lines pattern, waves.

curve stripe wave abstract certificate cover invitation invite collection banner booklet card template line corporate elegant menu texture vertical modern gradient striped blank royal digital diploma grid watermark sign white presentation catalog concept document efrac14 efrac34 eplusmn ecedil eraquo nefrac12 emicro nnnnefrac34 esup1 nnesup2 geometric backgrounds blue lines pattern waves design for postcard business