I've finished my last commission, which was for a pretty big force of 15mm Macedonians. All the figures were from Xyston Miniatures. They have a reputation as the very best 15mm ancients, the AB of their period, and they live up to it. Here are the hypaspists, which I painted using the same techniques of shading I would use on 28mm figures.
As you can see, my patron wanted to use these as silver shields. Should I ever decide to build a 15mm Macedonian army, I know which figures I'll use!