Thanks to an open source project, you can now quite easily adjust the colouring on the fan of the AMD Wraith Prism RGB cooler.
Since AMD don't officially provide their software for adjusting RGB on Linux, we're once again left to the community to fill in the gaps. Thankfully someone has done this, enter CM-RGB. Once of those utilities that's not even remotely essential, but very much nice to have.
CM-RGB offers up quite a lot of options for tweaking colours, with a fun example script of displaying CPU utilization with the ring LED's like the example gif the developer provided below:
Check it out on GitHub if you're interested.