Anyway, these ones are very easy, very cheap and very nice into the bargain!
Here's what I did...
Green-ness: 3/5 Its probably greener to send an email invite. Also used new products that probably cant be used again for anything else.
Frugal-ness: 5/5 Cost me $2 for the doilies and $4 for the ribbon. I thought $6 for 24 handmade invitations was ok!
Time cost: Maybe 4 hours from whoa to go. I made them in about 3 spurts of just over an hour each.
Skill level: The invitation is easy enough, getting the printed piece in the right place too a fair bit of computor skill. Although once you've got it, you can save it, change the details and use it again.
Fun-ness: This was a wonderful project - I enjoyed every step of it!