The Dunken Company offers a set of fantasy rules called The Stomping Ground. The rules were developed for Dunken’s line of 25mm molds for fantasy figures, but can be used with any. The company says that The Stomping Ground is:
the fantasy miniatures battle system that just says no to hard to learn rules, imagination choking character classes, and Asystem supporting only figures. In other words, with Stomping Grounds, you get to play with the figurines that you want to play with, regardless of size, appearance, and intended purpose. This game is very easy to learn yet it allows the players to develop strategies and command armies.