What do you do with randomly painted bits?

I have lots of projects that I would like to finish, but sometimes I paint things for no reason at all. The purple and gold shoulder pads, or the turquoise beaky marine bits are good examples of this. The auspex I might put in some future marine's hand, but these painting experiments are starting to accumulate in little piles around my painting area. What do other people do with all of this futuristic detritus?

The latest experiments started out as a way to try out some reaper paints I recently purchased. Quick paint samples turned into involved weathering. Unexpectedly, the turquoise bits are really evoking chapter building tendencies in me. I imagine them as abandoned armor recovered by some non astartes and hidden away in some collection. I am tempted to derail my hobby plans and paint up a full set of these guys. I really like how these weathered bits look. I can see a quartered chapter symbol with polaris in the top left and the the ultra-marines symbol in the bottom right. I imagine these would look good with dirt colored powders on their lower legs, simulating dust and toning down the weathering. Does it seem silly to anyone else to spawn a whole chapter based on one backpack, and a beaky head with a stripe? Am I just experiencing tyranid burn out?