I posted here some time back about making art on iphones, and I finally did it, well not on my Iphone but on Queenie's. It's a logo I've been playing with for her YouTube channel, it has a letter 'Q' with a crown in the middle. The inspiration is fairly clear with this one coming again from the works of Mark Rothko.
The program I used to do this was Sketch Book Mobile X, which was the lite verison or free version. I found the zooming and moving around the canvas a little difficult, and using my finger wasn't the best, I may have to hunt down a pen like this one to use.