Ideas for a fundraiser to buy my friend a head stone for her grave..?

Well, my best friend that I have known for 10 years was hit and killed by a truck going 55mph when she tried to cross the street over to me and my sister when we were waiting for the bus that morning. She died May 28, 2010. Her year anniversary was Saturday, and it has come to my attention that she still does not have a head stone at her grave. She has a plaque from the funeral home, but I want something more respectful and honorable. Her parents at first didn't want to put one there because they said it would kind of finalize what happened.. But since a year has gone by, they now would like to put a headstone there. So my friends that also witnessed the accident and I are trying to come up with some fundraising ideas so we can help my friend's parents pay for the head stone. My friend Sam said that she could get us a lot and the flea market and maybe hold a car wash there. I also put out the idea that maybe we could make and sell sno cones since it will be in the summer and people will want a cold treat. If anyone else has any ideas, please share them. It is much appreciated :) I want my friend to finally have a head stone that she deserves. My friends and I can get the money and give it to Olivia's (our friend that died) parents and they can design the head stone as they wish. Thank you! It means A LOT. :)