Since I don't really use CC and that is the biggest symbol based software I know of, I have thought about creating some mountain symbols based off of my tutorial style. Anyway, what is the general size in pixels people tend to make these at to both nice look and fairly decent file size in png format? Would 300 x 300 at 100 ppi be good or should it go higher or lower?

My thought was to do a few mountain symbols in a variety of orientations, including single mountains, a few 1-2-1 (one mountain on top, two below, one at the bottom), as well as a few that go diagonal \ and /. I also was thinking at least 3 different color pallets, brown, white and perhaps a grey? Thoughts?