With that out of the way, let's get to the meat of this particular box-art-focused post.
Berserk--I've never played this game, and probably never will, but that isn't stopping me from slobbering all over its cover art. My favorite part of said piece of cover art, by the way, is the blue-haired fairy, although that's mainly due to how she pops from the red-and-black backdrop that sits behind her.
Elemental Gimmick Gear--I nearly included this one in my last post on this subject. I can't remember what I went with instead, but I guess it doesn't matter now. Anyway, the illustration that serves as the focal point of this piece of box art is its highlight, if you ask me, although I think the minimalist logo is a nice touch, too.
Gunspike--I'm a real sucker for cover art like this. Cover art that's full of color and showcases an illustration that takes a few risks when it comes to how it's laid out. Sure, it's easy for a game's logo to get lost amidst such chaos, but I'm OK with that (in most cases).
Sengoku Turb--This one's sure to be deemed an odd selection, but I'm not going to back away from it, as I like pretty much every aspect of it. Its overall art style, which calls to mind Japanese calligraphy, is an obvious high point, of course, but its successful use of space (white space, especially) is worth a respectful nod to two as well.
Twinkle Star Sprites--I guess you could say this is the most traditional of all the examples shared here, but that doesn't make it any less impressive in my eyes. Granted, it's hard to hate on a piece of box art that's as cheerfully colorful (or colorfully cheerful?) as this game's is, isn't it?
See also: previous 'five favorites' posts