Some ideas to base your next 28mm army
The 28mm size, if you ask me, is the perfect balance between playability and modeling/painting. You can buy and assemble pretty good armies for any ruleset from ancient warfare to sci-fi skirmishing without investing too much money or time to paint them, with striking results. So, even if I prefer 15mm when it comes to competitive games and recreating full-scale battles, I often spend some time to paint and play 28mm miniatures.
However, on gaming tables, I equally often see very good painted miniatures with anonymous green bases. I think bases are so significant for the final look of an army (by the way, here are for Team Yankee, and ).