Noob question!

So i got this strimer plus extension thingy for free.. where can I connect this for some aesthetics? I'm also not sure I want to connect this to my GPU card if that's the only thing I can do with it.

MSI X870 tomahawk Xfx 7900xtx mag air R9 7900x Psu: corsair rm1000x

Sorry for bad quality pics