David Bowie Albums - sans The Laughing Gnome, Baal, Tin Machine, Tin Machine II and Toy. I'd throw the Davy Jones & the Lower Third, the Manish Boys, and the 1966 Pye Singles in there, too, for the sake of completeness.
Technically a single cover, but this is too excellent not to include. Bowie's 1974 single Rebel Rebel, taken from his legendary Diamond Dogs release. Bowie poses in full Ziggy Stardust get up, red shag/mullet, knee high platforms, shoulder pads and skin tight bodysuit, perfectly applied makeup and the iconic lightning bolt. Seriously cool.