Wow you must be really old! Phone booths?
Just go to a cemetery.
They say that's the reason why you have a bucket, ice, flowers, candles, white sheets(tablecloths)...
They say more like a yartziet , a person kicks the bucket, have ice to store the body, candles for the nishama, flowers and wrapped in a white sheet!
But yeh no need to scare the living daylights out of someone when a person is getting engaged! So wouldn't recommend a cemetery!
You can do something simple. mms.com. Her favorite colors. Some people don't like extravagant proposals.
Cute idea, but don't think they eat C"S, but the idea is amazing.
"There's a friend"
(Mazel Tov!)
Lol, sure will pass it on from stooges!