With Entangle - geometric drawing you start from a regular polygon of your choice and then add, move, and remove angles to create unique geometric patterns and shapes. To create further personalised drawing you can play with the width and dash pattern of each individual line. Once satisfied with your job you can export the image in JPG or in vectorial form, and finalise it with Adobe Illustrator, Photoshop, or with 3D modelling software. Entangle is built with C4, an open-source api for rapid-prototyping with animation, interaction and media on iOS.
Currently not for sale (it might not work on the latest iPhones and I need time to debug it).