Sand monster

I would love to see a mob, that drops sand and/or a variation dropping gravel. I imagine it to be some sort of sand blop, camuflaging in the desserts, around the dessert temple. Not only would it add a dimension of surprise (like silverfish) and excitement to the dessert (which, lets be honest, can be extremely mob crowded and open), but it also open the possibility to farm sand, for concrete and tnt.

(i can niether deny nor confirm the fact that i may have drawn inspiration from a certain tattoine scene from star wars...)