I think I would prefer cylindars to champagne flutes, as to not confuse as a drink. "Table decoration - Pine/herbs in a champagne flute.with some "snow" and some glitter and maybe some gold/silver this could be a pretty winter decoration"
If you're curious how to crochet on flip flops, this post will answer all your questions including if they fall apart over time. Great free tutorial on how to get started crocheting shoes and boots for spring, summer, fall, and winter.