This Applet allows you to Select foreground and background colours
You can
The Applet presents the colour values in either hex or [Red , Green , Blue] values these can then be simply highlighted in the text area using your mouse then cut and pasted to your computers clipboard useing what ever technique is suitable in your operationg environment (in Windows press the Ctl and the C key together). Once on the clipboard you can paste the figures in the appropriate place as Parameters for other applets.
As you can see the are Three types of background colours, light and dark, choose whichever is appropriate to you. These represent the highlight or lowlight versions of the colours. Different components use either one or the other.