Remember buying this on vinyl and being amazed at the detail that Derek Riggs gets into the cover with lots of little gags buried in the hieroglyphics.
I also like this cover of Animals by Pink Floyd.
I don't own this album, but when I was a kid I went past Battersea Power Station on the train when the inflatable pig was tied to the chimneys.
I didn't know this was used on a Pink Floyd cover until years later when I was passing the power station again on a train with a school friend. I told my friend about the pig and he told me about the album cover and showed me the sleeve in a record shop when we got to Victoria.
The LP Version of Space Ritual as it folds out to 12 different (and of course for Hawkwind bizarre) covers. Quality and quantity, thank you Barney Bubbles.