Most homes will have coloring pencils or crayons. In my house we also have glitter pens, foam pens and most importantly paints for the kids to select between. Using paints will require a little bit more setup time as you may need to clear an area and lay newspapers down over the table to protect it.
Batman cartoons are great, and they always seem to be on. There have been many of them over the last few decades. Best of all, every time they bring out a new one they seem to tweak the formula and keep things fresh. For example in the latest version called "Batman - The Brave and the Bold", Batman is a little less serious, while in previous versions of Batman cartoons he is seem as a very stern and serious figure. But best of all, there is a wide supporting BatFamily, so even if your child isn't big into Batman, there are other cool characters like Robin, BatGirl, Nightwing and the toys like the Batmobile, Batcopter etc. There is really always something for everyone when looking into Batman Coloring Pages.
Printable coloring pages can also be used for other purposes, like coloring contests. Many times the sheets left out on the contest table get wrinkled, ripped and ultimately unusable. So, find printable coloring pages online that you can send your patrons to! All they need is a home computer and a printer and they will have their contest entry picture. If they don't have a computer at home, print them off their printable coloring pages right on the spot!