it is a lovely idea in theory but my experience with secret pals is that there is always someone who signs up to be a pal then promptly forgets they did and their pal never gets any gifts and their feelings are hurt and rightly so.
There was a secret box goig around a year or so ago that ppl signed up for. the idea was oe perdon filled a box with nice gifts and sent it to the next person on the list. tha person got to keep what was in the box,refilled it wit new nice gifts ans sent it on,and etc. Some people complained that they filled it with nice gifts but the gifts they got were cheap and not very nice at all.
Somewhere along the line the person who was supposed to send it on never did. Thanks for offering but i must decline.