If you have been around the Android themeing scene for any amount of time you have surely stumbled upon the "Cobalt Theme" by developer "DustinB". This theme for Cyanogen Mod was one of the first themes i ever ran on my phone. One of the best parts of this theme to me was always the creative and unique app icons that came with the theme. In order to run this theme back in the day you would have needed to root, unlock bootloader, flash recovery, and flash an aosp rom. These days you can get all of the same icon themeing without root!
DustinB released his Cobalt Icon pack a while back but has recently updated it with 100 all new icons! This brings the total to well over 600 and you can rest assured that there are even more to come! There is also a custom wallpaper gallery included, as well as an icon request tool, and a visual for seeing what icons look like. Head to the link below for the download!
Via Play Store