to
1. Take your base out in the GIMP.
2. Duplicate the base layer and set the blending mode to 'soft light'
3. Repeat step 2.
4. Duplicate the base layer and drag it to the top. Set the blending mode to 'screen'
There isn't a preview pic for some reason...
5. Take out your curves tool (Layer - Colors - Curves)
6. Set the first channel to x: 140 y:211
Red: x: 83 y: 100
Blue: x: 93 y: 112
You should be done! Add some cute text and that's it!