Thanks everyone especially Brink - I followed your advice:
Open a cmd window and enter this line:
powercfg -list > c:\temp\pwr.txt
This outputs (and thus saves) the GUIDs to a text file pwr.txt
I downloaded your shortcuts and made an extra copy, changing the GUID to a custom plan I created for myself.
Then I drag-dropped the shortcuts onto App Launcher V3, a gadget for Win 7 and Vista (which I adore, but get the latest version (3.3.5.3), NOT the Windows Gadget Gallery.
Now all I need are some more icons (unique for each shortcut).
Before I stumbled on this thread I was just about to install Power Plan Assistant v2.5, recommended by WinSmith in post #5 in this thread, when I noticed, buried right at the bottom of the EULA, that it also installs OpenCandy (as does CDBurnerXP), a bit of privacy-intrusive adware, so I can't recommend it.