actually, the more cost-effective route would be to get the blank files off the hub's website and get copies made at costco, or sometplace ofc the sort. That's what I always did for my coloring pages for different cons. They can even just pull the files off a flash drive. And, that way you can easily take your creation with you, no worrying about accidently tearing the picture when you tear it out.
Yeah using the books is the most expensive and difficult way. My mom (a teacher) always made laminated copies of the original pages and then photocopied from those for the kids to color from. I think just having a coloring room would be fun. It's nice to get off your feet, good for all ages, and just an easy panel/event to run!
We could even have a coloring contest!
Oh or maybe a free hand drawing coloring contest with a time limit with voting?
EEEEEE I'M EXCITED.