I split them in 4 based on position having 1 for each 4 champs in that position. For example I currently have a page set up like so: Top: Teemo Cho'gath Vi Akali
Mid Karthus Katarina Leblanc Evelynn
ADC Miss Fortune Tristana Draven Caitlyn
Support Blitzcrank Sona Taric Thresh
Jungle Hecarim Skarner Alistar Kha'zix
Periodically I'll trade someone out. Either if I'm not having fun with them, or I am just not winning with them or if there is a new champ/fotm champ I want to play/exploit. I just wonder if anyone else does this. I've been doing this since I first started and I have played a lot of champs and it funny how some champs I were so bad with at first then I go back and I own with them. Katarina, Evenlyn and Karthus are my main examples here.
Anyway does anyone use a similar system? How do other use several champs? Do you just use 3 pages for all champs like my gold rated friend? I cant do that :(