Hello Sir,
I have source code of four android apps, please check if any of these seems interesting to you. All these are listed to ChupaMobile, so all these games have extensive documentation about how to reskin or change code. Instead of providing descriptions again, I am providing you the links to ChupaMobile, which have description & screen shots of the apps -
Color Match - Brain Game
http://www.chupamobile.com/products/details/2378/Color+Match+-+Brain+Game/
Task Switch - Brain Game
http://www.chupamobile.com/products/details/2406/Task+Switch+-+Brain+Game/
Alphabet Explorer
http://www.chupamobile.com/products/details/2446/Alphabet+Explorer/
Math Practice for Kids
http://www.chupamobile.com/products/details/2278/Math+Practice+for+Kids/
Let me know if any of these seems interesting to you & the licensing term so we can set a price.