Here's what I did...
Green-ness: 5/5 for reusing wax and containers that might otherwise end up in landfill!
Frugal-ness: $4 for a number of afternoons fun has got to be a bargain!
Time cost: About and hour the first afternoon and maybe 15 minutes for the second pour the next day.
Skill level: quite easy, if you track down a few instructions first!
Fun-ness: I had a very pleasant afternoon playing with melted wax. Quite therapeutic indeed!