yeah

all have to be thin
not too thick
once too think, accuracy will decrease as light might get diffracted when traveling down the not perfectly uniform density plastic

if your pic is large enuf, you might not need to sand as the pic will be the pixels that the sensor on the mouse will grab (instead of dots of roughed up textures as vee_ess suggested)


maybe, vee_ess, we should get together and make some awesome mousepads!
lol

damn too bad we are far away