.

I know what Eselsbrücken means, but what's a good translation for the word Eselbrücken itself... or if not an exact translation, a word or phrase which corresponds to it?

Mnemonic, memory aid, aide memoire, ....? I see the phrase "memory hook" in LEO, but it's not familiar to me - maybe it's more common in BE.

Anything more colorful?

(No one would say donkey bridge or jackass bridge, or at least no one would know what it means. And no one would say ass bridge because for the word ass, the donkey meaning has pretty much been pushed aside by the semi-vulgar meaning "bottom" (Arsch).)