[banana_boy]

Note: I am considering that you already know the basics of photshop, that is creating a new page, selecting tools, changing colors and stuff. Although if you have any questions, JUST ASK ^.^

The gradient tool is a very useful tool if you know how to use it. This tool lets you select 2 color (or more) and depending on where you click, the screen will show the different colours you chose in the respective order.



So lets start... I'm creating an 800x600 image though you can go ahead and choose different sizes.


Once that you have a new page, press on the gradient tool.



Now, the color you choose from the palette will affect the gradient colours.
Here's what I'm going to use:
Mass effect wallpaper
green primary colour
red secondary colour
2 layers



1.) Create a new layer at the bottom of the mass effect image
2.) Click and drap from right to left on second layer



3.) Go to first layer
4.) Change blending mode (I changed it to hard light) until you are satisfied with the result.

Note: You can always edit the picture a bit more by adding some effects.

Have fun and take care

[wafffles]

This is easy to do for anybody who cant d gradient or u can go layer>layer adjustments>gradient map
or sumfing like that, its better to set it on soft light or hard light with lower opacity