Ripple Directory
This was a normal app which provided contact address, phone number, location (on map) and a photograph of public and private places, like Schools, Colleges, Marketplaces, Hospitals etc. This could have been a great idea, but I didn't complete this Android app due to its quite large size. I too started to think that this wouldn't work and spending $25 on it was a waste of money, as well as time.
DS Mods
This too was a great app, which I made within 1 day, not fully complete tho, but layout and format was complete. This app worked perfectly with Material Design. But I couldn't complete this app either, because I was playing around with Material Design. I tried to change the color of ActionBar, StatusBar, and it was dead then. This could be a real hit but. This app provided Modded APKs, as well as Stock APKs, Paid and Free, both. Idea was of my friend, but the work was mine.
CGPA Calculator
So this is one of my latest projects, and I actually think this might work really good. I asked 25-30 people, and at max 2 people knew how to calculate CGPA, that too they weren't sure of. Even my Maths teacher didn't know. So what this app would do is just calculate the CGPA based on the percentage of 5 or 6 subjects entered. There'll be an option of calculating Percentage from marks too. App seems kinda easy, but really useful. Hopefully, if nothing wrong happens, the app would be complete by December 2015.