Making userpics

[kyoutenshi]

Thanks again for the help the other day. =)

I realise that this isn't entirely Dreamwidth-specific, but I'm looking to make myself some userpics, something I've never even tried before.

Can anybody here point me towards some good icon making tutorials?

I'm using GIMP, but I have no clue how much that'll affect it.

Sorry if this isn't quite the right community.