I want to redesign my bedroom. I play guitar so I need space for that, I play lots if video games so I want a gaming set up, and my favourite colour is black. The space I have is fairly large. 
Could you suggest ideas that I might like in my room as well?
As you play the guitar, may I suggest that you implement some sound proofing, this could be as simple as draping thick sheets from your walls, or using a more specialised solution, such as acoustic panels. 

As for other things you may like in your room, I would require more information about your tastes to make a better informed decision, but using the information you have already provided I would suggest adding RGB LED strips to your walls along your ceiling, skirting boards, and in the corners. Alternatively LED panels could provide more flexibility and allow for more creativity. Something else you could add to your room would be a “Recording” sign to the outside of your door, this could prevent unwanted intrusions while you are playing the guitar.

I hope that was helpful, again if I had more information about your tastes I could provide other suggestions.
What are some things I can do that are related to my favorite color, black?