This topic came to mind because I just ordered a Rhino for my Death Guard. I ordered an old Rogue Trade Rhino and was feeling good about it and then...my inner troll thought "Wait, I can have even more fun with this," and also ordered a silicon mould so I can make a Thomas the Tank Engine face with green stuff and I'm going to mount it on the front and integrate it into the paint scheme. That's my summer project, along with building up the squad that it's going to carry around.
My question is this: Anybody else do silly models or inside jokes like that with their armies? Discuss!