A lot of the comments are looking to find ways to get around the fact that entering text on a phone is a pain. Others have suggested creating 'art' but, personally I find a phone screen far too small for drawing on.

If you want to 'create' with your phone, why not use the feature it has which is actually as good as [and in some aspects better than] the equivalent 'proper' equipment. ie. the camera.

I'm a keen amateur photographer and have actually sold my SLR and compact cameras and now use my phone for 100% of my photography. It may lack some of the capabilities of my proper cameras, but [like most modern phone cameras] it's very good indeed and light years ahead of the equipment many of history's greatest photographers had access to, in their time. And, as the famous quote says; "The best camera is the one you have with you"

[and who of us leaves the house without our phones, these days?]

Next time you're thumb-twiddling somewhere, why not set yourself a photography project to kill the time:

* Find and photograph 'faces' in everyday objects

* Pick a random word [for example off a billboard] and take photos on that 'theme'

* Pretend you're a news photographer and record 'stories' on your journey to wherever you're going

* Photograph some everyday objects from weird angles and see if your mates can recognise them

* Try and find some 'beauty' in decay; dilapidated buildings, rubbish, grafitti, etc.

....and so on.