I gotta say, I love your paint jobs and your original stuff. And I can see you have some sculpting skills. Challenge yourself ! Go beyond the norm! Look at weird boxes or strange shaped throwaway stuff. Think out of the Nerf! I know ya got it in ya!
Scavenge for any thing that might look usable. I just cannibalized a old destroyed player piano and got tons of parts and bits! Forget custom mavericks, everybody and his troglodyte cousin does Nerf.
Just advise from a fellow prop builder...
There is a product you can buy that does instant rust also.