I'd be interested, assuming the glass was good quality (i.e.
borosilicate) and the size(s) useful.
I've never played with any, personally, so it's something I'd want to have a go with.
Bonus aspects:
1) Can easily be sterilized by boiling or putting in the dishwasher's sanitizing cycle.
2) Extremely hard (again, if it's borosilicate glass) and completely safe.
3) Fine with any type of lube you might want
4) Smooth surfaces (generally) so no trapping of "dirt" anywhere.