If you regularly enjoy modding your Android smartphone or tablet by running custom ROMs and such, it stands to reason that your tendency to dabble would also stretch to your computer. XDA Forum Member FrozenCow has, it would seem, taken this idea of a 'modding mentality' to the next level in the development of his DriveDroid app which, as the name implies, allows an Android device to double up as a convenient boot device for your computer.