What exactly is it that you want to do?
Maybe you want to create a gradient?? That way you can set the foreground with 1 color and the background with another and you will get the 2 color range in one layer.
To set these colors you have to click in the forground box at the bottom of the tool bar and a color picker box comes up where you can choose the color to your liking. This goes also for the background box.
Hope this helps
As for bringing old..... because unleash, because! :P