About 20 yrs ago I made a custom Risk! board, with 60 fields in stead of 42 and wooden pieces. When I bought my printer, one of the first things I did was replace the wooden pieces with plastics of my own design. The 1 and 5 armies are pretty basic. The 10 is based on 17th century dutch city fortifications.
Can be used in other board games as well of course.
might need a minimum of 10%
The single armies were printed in fields of 10 at a time.