I noticed just now that in the pbe (haven't tried this in the normal client, as I rarely get skins I own) you can craft a skin that is already unlocked via rp. I did not see this anywhere in the threads so posting here. Also, you can receive multiple of the same skin at the same time (this seems like a bug to me).
[Champions & Gameplay Feedback](http://boards.pbe.leagueoflegends.com/en/c/champions-gameplay-feedback)
[Client & New Features Feedback](http://boards.pbe.leagueoflegends.com/en/c/client-new-features-feedback)
[General PBE Feedback](http://boards.pbe.leagueoflegends.com/en/c/general-pbe-feedback)
[Report A Bug](http://pbr.pbe.leagueoflegends.com/)