Beck has released 8 major label albums. The two of Beck's most renouned albums were Odelay and Sea Change. Odelay was awarded Album of the Year by American magazine Rolling Stone and by UK publications NME and Mojo. Odelay also received a Grammy nomination for Best Album.
I found a little background and information to these 2 albums covers on Wikipedia as follows:
Odelay
'The title is a phonetic English rendering of the Mexican slang interjection "órale." The phrase "odelay" is repeated in the lyrics during the outro of the song "Lord Only Knows".
The album's unusual cover photo, which has been misinterpreted as a mop head jumping over a hurdle, is actually a real photo of a Komondor, a rare Hungarian breed of dog with thick matted hair. The image was chosen at the last minute after Beck failed to decide on an album cover. The image was presented to him by his girlfriend and was chosen almost out of desperation. The typeface was chosen by a record company worker.'
Sea Change
'Sea Change was released with four different album covers, each version containing distinct artwork on the CD and the booklet. There are also different hidden messages (lyrical snippets) written under each version's CD tray.
The original cover art for the album was used as an effigy in the music video for Beck's single "Lost Cause".'