I converted the ico file that comes with the Windows download into a png.

[user@home]$ convert LimeWire.ico LimeWire.png

You can get the ico file from the Windows zip or maybe from CVS.

http://www9.limewire.com:82/download...ireWinNoVM.zip

[user@home]$ unzip LimeWireWinNoVM.zip LimeWire.ico

I suppose you could also take a screen shot of the LimeWire window, open it in the GIMP and extract the picture of the lime.