I want icon to contain an image of a flowchart (like the current one), so the user can understand what the app is about. Though the image can differ from the current one.
When making an icon, please try to make it look like a real flowchart. Flowcharts usually start and end with oval or circle symbols, rhombus symbols are decisions (they have one or more incoming lines and several outgoing lines), rect symbols are processes (the have one outgoing and one or several incoming line).
App's tint colour is orange (#FF9500). Although this is not necessary, the main colour of the icon should be the same (like iBooks of Pages icon).