As I crawled in the Virtual Dumpster I call The Internet...
I Googled "plastic army soldiers used for art media" and got About 7,610,000 results (0.53 seconds)
Here is what popped up first!
Choreography for Plastic Army Men from David Fain on Vimeo.
I was originally trying to find this: Jean Pierre Seguin who makes art using toy soldiers. (link here)