This one took ages, it may not look it, but you have to remove everything you don't want coloured, using a layer mask. That took about an hour to do. But when done properly (or almost properly in this case), you can achieve some very nice images. Selective coloured images can provide a lot of emotion and focus in the image, when used in the right context. Thoughts?
That's amazing Waffles! I'm very impressed, it adds loads of life and vibe to an otherwise ordinary photo. Great work!