Proxomitron Mini-Logo (Tray Model)
Detailed Modification, 16x16 Pixels  -  Preview as Favicon

ptron16.ico -- contains 2 icons:  a 256color icon and a WinXP icon
ptron16.png -- looks like the WinXP icon
ptron16w.gif -- white background; looks like the WinXP icon
ptron16.gif -- transparent background; looks like the 256color icon

Completely free to use, but only for Proxomitron-related purposes.  :-)