Window crosshair for task-switching?

[Rafal Kolanski <rafalk cse unsw edu au>]

Fellow Sawfish users,

Recently, when switching from Eterm to gnome-terminal (UTF-8 
requirements), I noticed that when cycling windows using alt-tab that 
gnome-terminal actually doesn't react in any way to the "half-focused" 
state the cycle produces before you pick a window (Eterm changes the 
cursor to a solid block).

Essentially, when I run multiple gnome-terminals borderless I can't 
really tell them apart during alt-tabbing. So what I would like is some 
kind of "crosshair" (or artificial border) that, during window cycling, 
would be painted above the current window.

My lisp is very weak, so I was wondering if someone has any code doing 
something similar already :)

Yours Sincerely,

Rafal Kolanski.