Fae

I've seen most green fire experiments that involve borax use methanol or ethanol. Is there any other alcohol that I can use? Also, will it make a difference to the fire if the alcohol is denatured? Fire is generally dangerous, but is there any type of fuel or alcohol that is safer to use than others?

I'm a high school student and my school's Science Day is coming up soon. I'm in desperate need of interactive chemistry experiments that will attract students to come to my booth and not bore them. I was considering working with dry ice, since it was a hit last year, but unfortunately it's already been taken by another group. I considered liquid nitrogen experiments, but after a while I realised they were too dangerous and carried a big risk. I'm looking for something that my audience can participate in, something that a lot don't know about (that being said, reactions involving metals is out!). Something similar to the aspect of the dry ice experiments, whereby it's relatively harmless yet intriguing. It would also help if the materials are easily obtained. Please help ASAP!