LOL,yes I have seen it.I thought it was funny that the character had the same name as my favorite singer.
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Heres the best way to use gradients.
Create a new layer over your picture.
Now choose a gradient,and drag your mouse across the picture from one side to the other.
Now go to your main page of gimp,and click File>Dialogs>Layers.
Click the drop-down bar,and choose Screen or Overlay.(Whatever works best for the indivisual picture)
Fade the opacity by clicking the bar beneath the drop-down bar,and shoving it to the left.
Hope that makes sense!