Yesterday I discovered the Adobe Shape app for iPhone and iPad (sorry it's not available for android) and it's been blowing my mind! The app lets you take or upload a photo and turns that photo into a vector drawing.
If you aren't au fait with vectors and don't use Adobe Photoshop or Illustrator then it's still pretty darn cool as it gives a linocut style effect.
Using Adobe Shape App
Choose a photo and it shows you the outlines, click the tick...
And watch the vector drawing in progress!
Then save and it syncs to your Adobe Libraries for use in Illustrator etc...
I think they look jolly good finished off even without colour added in Illustrator!