I first learned about Snapchat Filters from Gary Vaynerchuk. What I have been doing since late last December was creating Community geofilters. Community Geofilters for snapchat are ones that are based on your location. Also they are free and ones that live forever within the app.
Knowing that many people are using something that you created is a great feeling. Also when you submit a geofilter to Snapchat there are guidelines that Snapchat has. The guidelines are not difficult at all. Also you want your artwork to be original meaning no logos, and etc. YOU have to be the one who has created it.
I have experienced rejection on filters I have submitted. Then after looking at them I had to be honest and thought deep about why it was rejected. After doing that I came to an understanding after a few minutes.
These are my stats for the Community Geofilters that I have live on snapchat. The places that I have Community Geofilters live are places here in South Florida. The program that I use is illustrator to vector my work. Because everything I have submitted is custom and hand drawn.
If you have the skills I definitely recommend creating a community geofilter for snapchat.