There are a lot of options you have when redesigning your room. Since you mentioned you like playing the guitar you could do the following:
- Setting up a Guitar rack to display it
- Using a Wall Mount for your Guitar
- Install dark acoustic panels to improve the sound in your room and give it a darker look

As for playing video games, you can:
- Make sure you have a big desk to put your PC on to prominently display it
- Improve the looks of your PC with a nice case or some RGB lights to give it some pop
- VESA mount your monitors to make your desk setup look cleaner

If you want some more options, feel free to ask!
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