Ron Ostafichuk has taken a full-size Dalek model and used a Raspberry Pi to control it. It even plays the Doctor Who theme tune when it’s ready to go! See a video of the Dalek in action and see inside this great project below. Leave Ron a comment or a like on the YouTube page
Mike Haldas has written a great tutorial which uses online service Instapush
to send push notifications to an Android/iOS app on your mobile phone. His example application is wired up to a door opening sensor and he's provided this sample code in his tutorial
Here's a wearable Raspberry Pi powered by a LIPO running pifm and a Python script to play music. A list of components can be found on this page
so it should be relatively simple to make your own!