I've found that when making maps for my favourite strategy game, Starcraft, I prefer to create them in 192*128 size. Not only it's fairly comfortable for most kinds of gameplay size-wise (and I rarely like it simple), but it also has... the 3:2 aspect ratio. I've only recently figured why I like it so much as opposed to - say - 128*128 or 192*192 square maps, or 256*192 (4:3) rectangular ones.
Yeah, psychology is a convoluted thing.
Yeah, psychology is a convoluted thing.