I've had this idea for a while now but haven't actually done it. I figured I would throw it out here and see if anyone else is interested.
Challenge: Creat a song using only instrumental sounds that come from any phone app. There are plenty of free music making aps to choose from in the Google play and iTunes ap stores. You can do it entirely on your phone or sample the sounds and use them in your DAW to creat the song. Vocals can be added however you would like but the instrumental must be done entirely with sounds from phone apps.
If you choose to participate in the challenge tag your song #phoneapp and share your song here.