While we are talking about colors …

As you know, thunderbird has gobs of options you can play with. I usually do not care much about how it looks and just use the default settings. The only thing I have done was to change the background color of sub-windows.

Thunderbird in color

This was easily done by editing the userChrome.css file in ~/.thunderbird/xxxxxx/chrome/ .

#folderPaneHeader,
#folderTree treecol,
#folderTree
{background-color: #ccf !important;}

#acctCentralGrid
{background-color: #cfc !important;}

#threadTree treecol,
#threadTree
{background-color: #fcc !important;}

#msgHeaderView,
#attachmentList
{background-color: #cfc !important;}

#folderpane_splitter,
#threadpane-splitter,
#attachment-splitter
{background-color: #00d !important;}