*Old stuff about Nox's sig here*
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Alright, next lesson. Turns out waiting for Dann was a bad idea again. This one is called "Color Balance". Depending on the options you choose, the opacity and the blend mode (overlay, screen, lighten etc.), you can change the colours or theme of the signature entirely. You can also pile several layers of adjustment layer with different themes on top of each other, or duplicate one to make the effect stronger.
Also, the Hue/Saturation/Lightness layer option is similar, but really does change the actual colour to the same colour. Try fiddling.
As your next assignment, I'd like you to use the following image and change its colours with the "Color Balance"
Example:
