You don't have to have everything come to rest, you just have to beat the clock. Putting the circles in each others' way slows them down too. In other words, put one at the top, the next right in its way, and so on.
How bout you scratch my back...#39? I'm just stacking them all up, placing the big vertical one on the left so that it falls to the right, and the horiz one on the top so it falls down on the slant, and the triangle I'm trying to wedge at the bottom right to make a stop when the blocks come sliding down.