Changing Window Frame Colours

[Contro]

Hi Guys!

Amazing custom interfaces I've found on here! I'm truly impressed! But I was wondering if it was possible to change the colour of the frames? I've had a look, but I just can't see how to do this. Do you have to download a mod for a colour change or something like that? The reason I ask, is because I've seen a screenshot of someone with purple frames, and it looked really nice.

Any help would be hugely appreciated! Thank you very much in advance!

Contro