Out of all the games you remember, which ones did you think had the best and worst box or cover artwork? You can even break this down by system, or just give several examples if you like.
Some of the worst cover art, in my opinion is on Phantasy Star II and Star Ocean: Till the End of Time. Some of the best include PSIII's Japan covers, Wild ARMs 3, Dark Cloud 2, and Arc the Lad: Twilight of Spirits.