Custom icons and icon sizes!
This is certainly not completed at all. You can apply an icon pack but not individual icons.
I would also like the ability to change individual App icons, not just select a complete icon pack.
Not sure if this really is completed. Do not see any way to change an icons for individual apps.
Sebastian Cork commented
What would be great is if it could support icon packs used for Apex/Nova/GO Launcher. This would make for a seamless interface across my phone.