Currently i make little apps whos useful for me.
ASColorChooser + (B4X) AutoSizeTextLabel + xCustomlistview + Tabstrip = Simply Big
The concept is simple, write a word and make it big on your screen. For Example your mobile number, or a Hey to a girl your'e like.
Simply Big on Google Play...
I use this App since 2 years, it is simple, just put your name and mobile number and copy it or show it in big. It is very fast and is perfectly for the business, because you can quickly exchange contact information.
This is a fictional number ;)
Here is the link to the app.