What should I do with my old Galaxy Nexus?

As per title, other than selling it or giving it away, what can I do to make it awesome again?

I'm currently using an iPhone 4 with iOS 7 and it's getting dull. I have a nexus 7 2013 and it made me switch on my old galaxy nexus again after a year in the box - it's still looks so sexy and I wanna use it again.

Basically I'm asking if I can make it fast and usable once more, preferrably with KitKat ROM if possible, etc.

I have no idea regarding rooting and roms etc so any advice would be greatly appreciated!

Happy holidays everyone!