Regimental badges are easy as they all tend to follow certain archetypes, i.e. Wreath + Badge + Motto or Regiment Nš + Crown or other National Device, and if you make a bank of these bits and put them together you can come up with many combinations.
The hardest bit on these was the demi sun on the First Imp. Regiment and the wreath of Thistle Leaves for the Highlanders as I made them entirely from scratch. The rest was modification of Corel Clip-art (e.g. The Imperial Crown is a rebuilt St Edward's Crown)