Any system, any region. I like that of Killzone 2 (although I dislike the game itself a bit, I never was an avid FPS player)
So many ha! I'd say my favourite is a tie between Bubble Bobble FMT and Splatterhouse FMT. Shamefully nabbed from Gamengai as I don't have pics of any of my copies to hand, hope that's ok GP. http://www.gamengai.com/info.html?type=games&id=927 (It's a china money pot...a pic of one of mine... ) http://www.gamengai.com/info.html?type=games&id=932
Lovely! The Bubble Bobble one is truly beautiful. I also love it a lot, but I do not own the game unfortunately. Three more favourites of mine: Phalanx, X68000. The port of this game isn't as good as other X68k games, but the beauty of this cover art always inspired my imagination. As if every shooting game starts with a lot of preparation by an entire crew, loading the ship with ammunition, kerosene et cetera. Fantastic art! I bought the game just to scan and enlarge this image I also love Rainbow Islands for Famicom... for obvious reasons! I think it captures the playfulness and childlike happiness of the gameplay perfectly in a sugary sweet artwork. To throw in some newer art - I think Katamari Damashii's PS2 cover is one of the most beautiful covers of the 128bit generation. It looks sleek, is funny, and summarizes the goal of game perfectly in a nutshell.
It's too dificult to choose just one. Can't really pick one at random. As for Killzone2 alphagamer, i prefer the European / Asian cover: http://www.buttonmasher.co.nz/wp-content/uploads/Killzone2coverart_127DE/killzone2cover_thumb.jpg
At first I thought that was a book cover, and ironically that game got some of the worst cover art from any SNES game (http://upload.wikimedia.org/wikipedia/en/0/02/Phalanx_North_American_SNES_box_art.jpg) I can't think of one specific one right now, let me think about it for a while.
Gotta go with NTSC Ico and Deadly Premonition... wait. In all seriousness, I've always been a fan of Final Fantasy IX's and X's cover art.
I really like Star Wars: Rogue Squadron box art, I don't know if it is my favorite but it is one of them for sure.
I could not number all my favorite covers. The world of gaming covers has many real masterpieces, but i will try to pick some i like a lot: Spoiler (Defender, Atari) (I`ve seem a Nes Renegade cartridge with this same cover art, long time ago)
One of the best games ever made. I still play DOOM every now and then. I use to play it on my 360 but I have since migrated to GZDoom and using the WAD from the SW disc and some old DOOM floppy backups. I still use the 360 controller on there.
I had posted some covers here yesterday, but they didnt show up :S (i may have done something wrong about it, don`t really know)