Community member Bhoritz found some great parchment-style maps by Gogots on Deviantart. The artist also provides all the mapping elements to make your own. Gogots gives the authorization to use the maps and elements to post or publish for non-commercial products. There is an associated YouTube channel with explanations on how to use the resources (if you read French). However, the explanations aren’t really needed since the map building is just copy/paste in either Photoshop or Gimp. Below is an example of what you can create.