Is there a tool invoking which I can draw lines at random locations in the Mac desktop without disrupting the ongoing interaction on the active window?

Some background context -- I want to take the shortest route to configure a personal motivator that would play a sound (and draw something on the screen to get my attention) every 10 minutes.

I know that I can write a Cocoa app, but that is too much effort (especially when I never did Mac GUI programming), instead I'm looking for scriptable solutions. Sort of like nodebox but drawing on the screen directly without disrupting the active window interaction (eg: the reminder-drawing could happen while I'm typing on my editor, and yet don't disrupt my editing).

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