In early TLXOS 3.x releases (based on Emdebian) we used icewm because of its
small size.

According to the ChangeLog, we made the following changes (I don't recall why):

  * Install only a single external theme (xp-new).
  * Added patch to replace CenterLargeWindows option with a RandomPlacement
    option (disabled by default).
  * Added experimental _NET_WM_FULLSCREEN_MONITORS patch.