Not especially original viewpoint but I think Sgt Pepper’s Lonely Hearts Club Band is a great cover. In fact as a kid I used to have it propped up atop my dresser and had the faces pretty much memorized.
Gotta mention two minimalistic, but textured*, LPs:
Fear of Music – Talking Heads. Black, stamped with an industrial design one normally associates with steel loading ramps and the like. Very formidable and unfriendly looking ("…this ain’t no party, this ain’t no disco," indeed). Band and album title are in a neon green in the corner.
English Settlement – XTC. The Uffington Chalk Horse, an Iron Age environmental glyph of sorts, is reproduced on a field of mossy green. At the top, the band and album names are in a Celtic rune-like font.
That is, in their original vinyl format. Although a Japanese company has since reissued most of the XTC catalogue on CD with the original packaging concepts, so us XTC geeks are happy now.