OMG...Is This Real?

OK, who can remember a sheet of thin, transparent plastic that you cut to size and stuck over your black & white TV screen? The top portion of the screen was blue for the sky, the middle had a reddish tint, and the bottom was green for grass. Possibly one other person on here, I'd guess.

I can! Granny had it during the seventies ... only she had a "deluxe" glass variant!
Quite heavy glass in the three listed colours was placed in front of the screen of the black and white TV using special holders that held both lower parts of the glass. Grandma resisted buying a colour TV for a long time, because she simply didn't see the need for something like that...