Colors have continued to amaze me ; and when i stumbled upon doing some selective coloring on my own was simply spellbound by the end result(though it still looks a little amateurish).
This post quickly expatiates on selective coloring using GIMP .
Original image clicked using Nikon D50 @ 24mm, f/5, 1/100s.
Shutter prioity [as always;) ]
After Applying selective coloring :
1) Open the original image in GIMP
2) Image > Mode > Grayscale
6) ctrl +v (this creates a layer - a foreground grayscale layer)
7) Either Tools > Paint Tools > Eraser or Shift+E
8) start 'Erasing' the foreground - you will see the background color layer.
Hope that helps :)