Mother of pearl.
3 seconds sound clip from the The Muppet Christmas Carol movie soundboard.
You can hear this line at 01:05:33 in the Blu-ray version of the movie.
Quote context
[...]
- So, back from the house of sadness, I see.
- Hmph! Sad that he didn't die years ago, the old skinflint.
- Well, let me see... What do you got for old Joe, huh? What do you got for me... To remember him by?
- Well, I got these collar buttons from his dresser...
- No, no, no, no, no. I got his bed curtains... Very fine damask. Ha ha hoo hoo!
- Very cheap damask... But worth a few coins.
- Why, Mrs. Dilber, they're still warm!
- I don't pay extra for the warmth, you know.
- You should. It's the only warmth he ever had.
[...]