Ball sitting on leaves

My ball came to rest under trees on a thick bed of loose/dead leaves.  I know you are allowed to remove loose impediments so long as your ball doesn't move.  But taken to the extreme, I could have moved A LOT of leaves around my ball, significantly improving my ability to strike the ball.  At what point would such action be deemed to be unfairly improving one's lie and/or creating/modifying a stance?

You can move as many as you want as long as your ball doesn't move.  It's a bit like that game where you try to remove the sticks without the pile collapsing.  But as Santo says, don't be greedy!

Also, just a side thought.  Don't ground you club when the ball is sitting on leaves, pine needles or similar.  The action of grounding the club can cause your ball to move and you get a penalty

oh and dont forget dont move the leaves in a bunker :doh: