I dowloaded a Nokia Snake emulator for my Nexus 5X. It came with a number of Nokia Model 'overlays' which was nice, so it looked like the keypad and screen of your favourite model. I didn't play it for long though.
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I also downloaded 'Dancehall sound FX' so that I could play blaring air horns and laser sound effects to drown out people talking in meetings if I didn't like what they were saying.
It also has voice FX so I can play a stab of someone yelling 'Lick it up rudebwoy', 'ease up rassclat' and 'REWIND SELECTA'. I have yet to find appropriate usage for these but they amuse me regardless.