If you are lucky enough to have acquired HeroScape terrain, you may be interested in these Colonial Rules For Heroscape terrain.
colonial
DBX Colonial Rules
Pushing Tin offers a set of colonial rules in the DBX style.
Prehistoric Pocket Dinosaur Hunt Game
Prehistoric Pocket is a game of Lost World Dinosaur hunts. Interestingly, it uses coin flips instead of die rolls to resolve actions.
Sandokan: The Malayan Tiger Colonial Rules
Sandokan: The Malayan Tiger is a set of free wargames rules for fast play colonial wargames set in Asia.
Imperius Maximus
Imperius Maximus is a DBA variant for colonial wargames.