Eco friendly heater

Decided to reverse the air flow in one of my PC's so that it expels hot air from the front rather than wasting all this heat at the back of the desk (where it is also difficult to escape). Temps haven't changed much in the case but again I don't have airflow sensitive components.
Seems to be a good idea for cold winter days. At least it warms up my slippers

Any people with similar ideas? Watercooling would seem to give even more interesting options

Mite keep your slippers slighty warm , but why not warm your feet on the power supply once you have taken off the caseing.

Tried it, didn't help much probably because I unplugged it,.