a literary, musical, or artistic piece consisting wholly or chiefly of motifs or techniques borrowed from one or more sources.

an incongruous combination of materials, forms, motifs, etc., taken from different sources; hodgepodge.

noun

assortment , collage , collection , compilation , copy , hodgepodge , imitation , mishmosh , paste-up , patchwork , potpourri , reappropriation , reproduction , synthesis , jumble , medley , olio