I could provide a few good ones, and, WWR, download GIMP 2.4. I had 2.2, and when I got 2.4, I only noticed one difference (Instead of Ctrl+K being the shortcut for 'delete', the Delete button was).

'Kay, here's one I used when I was making sigs close to yours:

Full Sig Tut

If you want more, go to GIMP Talk.

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