Recommend a flashlight target Please

Can anyone recommend a good paper target for flashlights? Something that I can buy 20 of so I can replace it everytime my kids draw on it. IT has to be mostly white. Large. Like 3'x3' well you all know what I'm talking about.

If I get a standard target then I can get serious about archiving beamshots of all the lights I ever get a hold of.

Something like this http://darkgear.com/beams Warning pics are not optimized for the web so it requires alot of bandwidth.

This is something I was playing with but never did anything more with. Mostly because without a paper target the beams look all grainy because of the wall texture. It might be a nice thing to have if I ever get serious about it.

Best regards,
Randy

I don't know about the paper target, but the comparison method is great!!

Darkgear,
See if you can get some paper laminated. Or maybe the exterior of a white fridge (or other white appliances). Chances are your kids aren't going to draw on those appliances. Try these suggestions first.