Sponsor a piece of set

Sets are works of art, and we're slaving over them to make them look amazing. Usually, though, they'd get thrown away at the end of filming. But imagine this:

Your friend: "Gary, what's this interesting piece of wood here with the weird pattern on your coffee table?".

You: "Why that's an actual roof tile from Hold Excalibur! It's now worth a lot. " 

Your friend: "Oh Gary, you're so cool. And I note also that you supported Welsh culture, avoided waste, and bagged yourself something totally unique."