I don't listen to any other bands so I don't know anything else.
I tried some LOG but my arms got tired after downpicking that fast for like 5 secs!!
Most popular metal bands bore me so I'm afraid my riffs will always be predictable.
When I played "The Riff Game" on another forum, instead of making people guess what you're playing, someone wrote a list of 5 riffs and someone had to pick one, play it, upload it and then take one off the list and replace it with one of their own.
In the end, we ended up with 25 riffs on the list because noone recorded anything but people kept suggesting stuff so it built up.
I think it'd be an interesting way to do it here too 'cause it gets people learning stuff that they normally wouldn't. For example, me learning Bathory, Black Sabbath, Dark Tranquility, Death, Dream Theater, Led Zepplin, Megadeth, Iron Maiden, Slipknot, Slayer, Wintersun, RATM, Meshuggah, Opeth etc etc.