http://members.asternic.biz/knowledge_base/howto-how-to-change-presence-options-in-fop2

The original line is:

presence[''] = '';

Changing that to another color, such as:
presence[''] = '#00d020';

Will change the color for "Available" in earlier versions, such as 2.30

NOTE: I am aware that the additional presence status names and colors (except for "other" and "Available" ) can be edited on the FOP2 Manager now, under Settings, presenceOptions

I changed the color for "Other" by locating the color within fop2.js and replacing it:
Edit fop.js and substitute FFFF00 for 00D020 in the function. Then save that and restart FOP2 and it changes that background color.

So my questions is: has anyone found the correct way to change the default color for Available? I suspect that I need to make a custom theme for CSS.