I made some Planet Mat and an Old Map brush.
You can use Modo Indie for the Planet Mat and for the Old Brush Map you can use Photoshop for that or import it to Gimp via abr translator.
Klanderud_RPG_Planet_Mat
http://community.thefoundry.co.uk/asset/materials/view.aspx?id=4275
I made some Old Map brushes in Adobe when I was teaching a class last month in Fukuoka Japan. Its on my Google drive
Here is the old map brushes
https://drive.google.com/file/d/0B5KhohzJHDcldllKa1NWTXRmS3c/edit?usp=sharing
https://drive.google.com/file/d/0B5KhohzJHDcldllKa1NWTXRmS3c/edit?usp=sharing