My side project now is a pair of Imperial Guard/Astra Militarum Commissars. I do not really play IG/AM but I do have 40 Stormtroopers left over from the 3rd Edition Grey Knights Codex when you needed cheep Troops to make them a fieldable army. The idea is to use them to make a Militarum Tempestus army. I have some Valkyries chilling in the tower of new minis to use as the chariots of the gods.
I painted the Powerfist and book guy before and traded him for a dinky Codex. Now, I have a spare even if one of these guys get traded.