Two Completely Different Suggestions:
First: when looking at champions online or in the store, we have a feature for filtering which champions we are looking at; Assassin, Fighter, Mage, etc. Why dont we have similar filters during champion selection? These tabs could stand next to the current "champion" tab at the top of the page. Or similarly, can we create sub categories for champion select the same way we have them for the shop. e.g. we could create pages for mid-laners, ADCs, Bans. etc.
Second: my idea was to create a space in riot where you could vote for new skin ideas. to make a suggestion costs 10 (or 100) rp, to vote for a suggestion costs 1 (or 10) rp. Riot would get final say over what is acceptable/possible within copyrights etc. Whenever a suggestion is selected for production (depending on difficulty maybe one of the most voted skins each month?) the person who suggested it gets the skin free (and/or gets a rp reward). another possible feature could be that every rp you donated towards a skins selection- you get off when buying the skin.