Twisted Treeline: Blue team=Left side, Purple team=Right side.
Crystal Scar: Blue team=Left side, Purple team=Right side.
Summoner's Rift: Blue team=Bottom left, Purple team=Top right.
Do you see which of these doesn't fit? :P
changing the camera angle to a more top down view might not be the best, or easiest change. Why not just rotate the map 45 degrees clockwise? that way blue=left and purple=right, like all the other maps. I think this would be the easiest change to impliment. a simple 45 degree rotation and no longer will you have to fight the camera when attacking top & mid, or defending bottom. Sound like a good fix?
I would get into MS Paint and take the in-game mini map and rotate it 45 degrees, but paint only lets me rotate by right angles. If anyone is willing, could they post an image of the Mini Map rotated 45 degrees clockwise?