Custom ROMS ?

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http://androidforums.com – Hello !! I've just rooted my galaxy S3 GT i9300 on 4.0.4 ICS system and now I'm thinking about installing custom ROM... I don't have a Jelly Bean (and don't know if It's allready available) and I was looking for custom ROMS which are Jelly Bean ROM-s. Is it necessary for me to have a Jelly Bean on the phone or will it work on ICS too :confused: I don't quite understand this ROM things so I don't want to brick my phone !! (General)