Qactus
Romani ite domum
Big&Small and Medium&Small are much more different than their names may suggest.Rolled up a handful of Big-and-Small maps myself because I was curious what everyone was talking about.
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Big&Small is actually a decent mapscript if you like water maps and don't mind having some AI with strong and some with weak starting positions. Obviously it's not suited for multiplayer. I play it a lot and like the randomness of it.
Spoiler Big&Small :

Medium&small (which OP rolled here) is the opposite of randomness in creating these strictly separate regions for ocean and land that to me just seem unnatural.
Spoiler Medium&Small :
