This year, the maps appearing in my Friday Maps blog feature are being released for free under a royalty-free personal and commercial license. So you can take these maps, use them as is, modify them, change and abuse them as you will for your personal games, even stick them in your commercial products if you want. The only thing you have to do is credit me, +Steve C, with the original cartography (or maps, blah blah) in your product.
If you should require it, the maps on this page are also released by +Steve C under the Creative Commons Attribution 4.0 International License [CC-BY-4.0].
The "Warrens #1" hi-res .png
The "Tomb #1" hi-res .png
This work is licensed under a Creative Commons Attribution 4.0 International License.