I had d/l'ed Moonchaos' pack before, I don't recall the reason but I didn't really use his randoms. If it wasn't for pics that weren't uniques I don't know why I wouldn't have.
Haha, I looked through his Winx and Avatar packs, there were some pics that seemed odd to me, but I don't know either series so I can't really make any legitimate comments on that.
Graphic Novel characters would probably be great subjects for randoms, a little more obscure and a lot less likely to show up as a unique. I once tried to make a pack for Saya from Saya no Uta but couldn't find enough pics. So the problem would be finding pics, so if you have a bundle that would be a big step forward.