Snow:
Let's make it snow....digitally
1. place any selection of footage on video line 1
2. Here comes the tricky part
3. You are going to create snow flakes/ dots in New Titles
4. Give them movement
5. You will probably have to create 15-20 titles of snow to place on top of the main video 1
6. Give each line movement (Downward)
7. Make some flakes transparent
8. Poof, we have snow
tutorial 2
Split Screen:
https://www.bing.com/videos/search?q=adobe+premiere+pro+cc+split+screen+tutorial&view=detail&mid=908B09594FB1297CECAB908B09594FB1297CECABSplit screen&FORM=VIRE
Use your project footage to create your own split screen project
