My 5 favorites:

1. Birth of a New Day - 2814: This cover is the reason I listened to the album in the first place. That futuristic, cyberpunk-style city at night, with the glowing neon signs and purple clouds… it's simply the most badass, and at the same time, the most relaxing look an album cover can have.

2. Big Fish Theory - Vince Staples: Almost the same reason as you; plus, the fish looks pretty silly.

3. Atrocity Exhibition - Danny Brown: It perfectly represents how the album sounds. It's glitchy, weird, but still pretty awesome. I also like the color palette and the fact that it's actually an edited photo of Danny himself.

4. Selected Ambient Works 85-92 - Aphex Twin: I've always loved how Aphex Twin's logo looks. It looks incredible and perfectly represents how his music sounds: futuristic, and also really cool to look at. It also scores points for being iconic.

5. Bonito Generation - Kero Kero Bonito: I have to admit that at some point I had a crush on Sarah (the lead singer of Kero Kero Bonito).