Iqons are a cool thing to help users of your app to make sure they entered the correct address. Have a look at this first version of a little tutorial on how to use Iqons as part of the “Basics” series.
https://nimiq.github.io/tutorials/basics-5-iqons
Looking forward to your feedback! 
Also, let me know if you have ideas for other tutorials that will help new Nimiq devs to get started quickly and easily.