Flossy Snow

Open a new document with a black background ( 400 x 400 pixels will be fine )

Type some text and add the following layer styles:

Let's add a layer style for this white rectangles:

This is the result:

Hold the Ctrl key down and press on the layer thumbnail

You will notice that you have selected all the text

Grab the Rectangular Marquee Tool

Select " Subtract from selection " and make a selection like in the next image

When you release the mouse button you will have only the top part of the text selected

Go to Select > Feather or press Ctrl+Alt+D

Change the feather radius to 5 pixels and press OK

Move the selection with the up arrow key

Create a new layer ( press Ctrl+Shift+Alt+N ) and fill your selection with white Then press Ctrl+D to deselect your selection

Now add the following layer styles

This is the result:

If you want to add more details duplicate this layer ( press Ctrl+J ) then change the Blending Mode , Opacity and Fill like in the next image

This is my final result. I hope you like it