Useful and FUN!
You can use this to make really strange brushes. And then use them in the adobe sketch app, which is also free. I took a screenshot of a pot I made in Lets Create Pottery, erased the background and made it into a brush. And when I paint with it it looks like a big snake. Yes this is silly.
You can make perfectly sensible brushes too. And get raw pictures to make into brushes from market inside the app. So far its free. (Or take pictures with your iPad camera) This app is great if you want to paint with textures and make things that are sort of like collages. And also for skillful people for making your own brushes like in desktop Photoshop.
PS if you like fiddling around with gadgets the process of MAKING the brushes is also a lot of fun.
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Adobe Capture: Illustrator, Ps, v2.1.1