Image Size? Hmmm...

[Taffu]

I'm currently working on some custom Skins (to be released at a later date), however I've noticed something that's got me riddled about some of the current base letterbox skins that are already available. I'm well aware of the "Power of 2" staple...coming from WoW and doing a lot of custom image work in that game.

However, almost every skin I've used up to this point has a height that does not conform to this rule. Most common, I see a height around 85 pixels. So my curiousity is peaked...can the sizes be "other" than powers of 2?