I finally finish this extension before christmas !

Congratulation to me(#

.

this is how it looks like.

and you can setting the color ,fall down speed and image 

You can download this extension at 

https://github.com/andy840119/VisualStudioSnowEffect_Extension

.

And source code is in there : )

https://github.com/andy840119/VisualStudioSnowEffect

It is modified from Power Mode

.