JCC has been hosting some Bob Ross paint nights as way to destress. You can find Bob Ross painting on Youtube.

Make online abstract art that you can save. See an example pictured above. There are different patterns that the circles move in creating different patterns.

Both have in-app purchase capability

Paint by Number is a free app that can be used on apple or andriod.

Additionally another free app that you can color by Number is Unicorn- Paint By Number -- there you can even take pictures and then paint them by the blocks. You can this for PC here, Andrioid, or Apple.