Okay, so for the manual photo filter, you need to set up the color as 010cc1 and then go up to Layer-->New Layer-->From Foreground Color. Then you go and play with the blending modes until you find something that you like. I usually use soft light or something. Reduce the opacity to fit what you want.
Then after that I ended up going into the curves again and playing with those since it looks a bit different in GIMP. There was way too much blue so I reduced that a bit in the blue curves channel and I played around a bit with the color balance and hue.
Hope that helped! (: