I needed to use custom colour map pins on a Google Map which showed numbers for the different pins (1-42) and this generator allowed me to do that and choose any colour I needed. They have sets for various other categories too like military, aviation, police, historic sites, nature, sports, etc.
The Map Icons Collection is a set of more than 1000 free and customizable icons to use as place marks for your POI (Point of Interests) locations on your maps.
License: Icons are available under the Creative Commons Attribution-Share Alike 3.0 Unported license (CC BY SA 3.0) which lets you remix, tweak, and build upon their work even for commercial reasons, as long as you credit the project and license your new creations under the identical terms. Please credit as follows: Maps Icons Collection #^https://mapicons.mapsmarker.com
#^Map Icons Collection – 1000+ free & customizable icons for maps
Map Icons Collection is a set of 1000+ free & customizable icons to use as placemarks for maps