In my recent mapping challenge I marked the camps with glyphs meant to destinguish one army from the other. Both sets of glyph where taken from

and flipped either horrizontally or vertically and or rotated 90 degrees.

it a good way to get quick symbold. Or even just as a first step for a set of your own symbols based on their styles.

thought some might be intrested in using this site for many uses.