Reddit is Fun is the workhorse of Android Reddit clients. It's minimalist and snappy – no time for fancy animations and effects, there is Redditing to be done. The app has a ton of features, and it just got some more with a big update to version 3.0.
The custom themes are going to be supported through a new site, redditthemes.com. Designers will be able to create themes and sell them inside Reddit is Fun.