iOS has filters and drawing apps up the wazoo, so it can be hard to see the point of new ones. But Isometric allows you to create and manipulate designs and optical illusions that are weirdly compelling. It's something about starting from a blank screen and building such a dimensional pattern.
To make geometric art in Isometric you manipulate and colour 60-degree rhombuses. You can save your work as .pngs or share it to Instagram. And Made With Isometric is a Tumblr where the developers share the stuff they've made. The app is $US2 and is compatible with iPhone and iPad. [AppAdvice]