Is there a way to change it?
It would help if you explained exactly what you are talking about.
When I first booted osmc on raspberry pi 3 from micro SD may 2017 version the blue gray osmc screen came up. Hooked up using HDMI cable. However after filling in choices for country when the skin loaded it is pink. I think most people have gray screens so want to change appearance.
OK, I’m betting that you have a bad/counterfeit SD card. If you have another SD card available, try using that one. Or post logs from your current setup.
Your TV most likely advertises support for colour outputs it doesn’t support. I’ve seen this with old Phillips TVs, but hard to speculate without logs.
Thanks Sam that worked. Thank you for developing osmc.