http://www.smbxgame.com/forums/v ... f=34&t=827
This progect uses the graphic your looking for.
And for the rising and lowering effects,
1-create a layer called "snow"
2-now create 2 effects,"rise" and "lower"
3-make it so they trigger each after a certain amount of time
4-now check the "auto start" box in the rise event,
5-set the layer movement to snow for both events
6-in the ''vertical movement'' box set the same numbers for each event but make one a negative number,for example,0.5 for rise and -0.5 for lower.
7-Test the level to see if you did it right