Ok here is an easy tutorial that gives pretty cool results.
Difficulty: Easy
Program: Photoshop CS
Ok lets get started. I used this image below;
Step One:
Duplicate your base image and set it to Screen
*You might want to do it a couple times(depends on the image)
Step Two:
New Fill Layer ( #68CEE6 ) set to Color Burn
Step Three:
New Fill Layer ( #F293C9 ) set to Multiply
Step Three:
New Fill Layer ( #F8F1A2 ) set to Multiply
Step Three:
Finally, duplicate your base image and drag it to the top. Then set it to Overlay and your done!
I also got the same effect, using this tutorial, on the picture in the previous most.