Here's my third tutorial.
Tutorial #3
Colouring for Gimp
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To get this:
(Leastwise, I'm pretty sure this was the result that I got, if not, tell me please! Thanks!)
1: Get your base ready
2:Duplicate your base three times, setting the first two to screen, and the third to soft light.
3: Go Hue/Saturation. Set the red to 44, the blue to 100, and green to 59.
4: Create a fill layer and fill with 400000 and set to exclusion.
5: Duplicate your base and bring to the top. Set to soft light, and flatten your image.
Add whatever brushes/text you wish, and you're done! :)