I debated how to do this, and have decided to put up one page of different troops I've painted that can be used for the various Greek or Successor armies. One of the beauties of this period is that by painting up some basic, standard troop types, you can field multiple armies. As a matter of fact, many cross over even more widely -- many of the psiloi, for example, of Graeco-Hellenistic armies can be used for Roman ones, and may of the auxilia or warbands for Carthaginian or even late Republic Romans.
So, rather than an army list by army list series of pages, here is a tour of some of the Classical Era troops I've painted up, that can be used for the multitude of DBA Greek or Hellenistic armies...
These hoplites are all Essex. I did a lot of research into shield designs before painting them, going to the library and examining designs on the shields of Hoplites pictured in various books. I painted up 14 stands of them, rationalizing that I would be so burnt out on shield designs that I'd be unlikely to take up painting them again. My hard work must have paid off, as I still remember using this army in Midnight Madness at Cold Wars and having my opponent whip out a sketch pad and begin copying down my shield patterns. And that was after he offered to buy them off of me...!
This troop type spelled the end of the Hoplite era of warfare, generally. These are Essex's "Eastern Phalangites" that I chose specifically because it would be easiest to snip off their lead pikes and replace them with piano wire ones. Nowadays, I use brass wire over piano wire, but the concept is the same. I also drove the wire itself into the wooden base of the stand so that it would have two points of contact -- the figure's hand and the base.
Perhaps some of the most colorful troops of the entire Graeco-Hellenistic era are these wild and wooley barbarians from northern Greece. These figures are a mix of Essex and Minifigs, and I decided to go crazy on the cloak patterns. In sources from the period, they are described as colorful and having "geometric patterns." So, I pretty much used my imagination on these, and am quite happy with them.