I have some old sundae glasses that I would like to reuse. Any ideas?

Get some ice cream and hot fudge. Put the ice cream in the sundae glasses and add the hot fudge sauce. Be sure to warm the sauce. Put a cherry on top, if desired.

You can add chopped nuts. Pecans would be good.

How about making candles.Buy wax and wicks.

Used as vases for smaller fresh cut flowers, or for snacking . Fill with pretzels, popcorn, crackers,etc.

My first thought is to invite some friends over and have a ice cream social. Have plenty of fixings available. You could also use them to hold small "goodies" and give as Christmas gifts to your neighbors, mailman, priest, friends,etc. Use saran to cover them and tie with curling ribbon.

Fill them with wax and make homemade candles.

Stick them together to make tall container for flowers or candles etc. Stick them together to form a fountain?