You can...
make the icon states 1 pixel wide and translucent=nothing but text.(and button if you do them)
make button trans in first state and blend text into logoff graphic...only showing text on mouseover
content margin the logoff area to the point it just says logoff and turnoff...or even completely off the bottom so they have to logoff with the taskmanager...heheh
content margin the logoff so titghtly vertically that only a sliver of color shows on mouseover...no text ,but trust me...people wont read your description or find them easily.(thanks for the tore up XP mention 
)
With the right icons and button graphic,combined with the right text color you could put a button just behind the icon and the text would sit on the logoff graphic...blending in...but there would be a gap between the buttons where the text actually was.
Like...draw your button square but add some trans to the right(blank space)and use your sizing margins to keep the button off the text.(so it only draws to the left side,over the icon)(expands trans to the right)
confused yet? 
