hi I'm a big fan of alternative rock and metal, i was wondering how to write alternative riffs, what a good tuning 4 alternative metal
Standard tuning, but it should be the one that suits YOU most. And, alternative metal is a veeeeery broad genre, pretty much all that can't be cathegorized is "alternative".

Also, some great alternative metal:
I live near Lake Bodom WORSHIP MEEEEEEE

Quote by Sami Philadelph
LOL, for some reason the impression I get from you is like some wacky Frank Zappa of metal pulling pranks at the Grammys and telling crude jokes during interviews.
this forum is for asking recording questions and showing off your riffs and recordings (the subforums). ask in something like MT or the B&A section that fits that style. EG might work, but its not exactly the right place for it.