Any ideas for these surplus units?

We have so many spare units. Not sure how they can be put to good use or if there's a way to trade them in somewhere like HBG where they would sell them on.

Alternatively, was considering keeping them and maybe painting to represent other factions or custom factions.

We have literally hundreds of spare units of almost every type and that's after allocating way more than in necessary to our G40 setup.

Any ideas, suggestions or methods of having these do more than just gather dust would be appreciated.