I don’t think I’ve ever seen the horizon on Mars, they always show the rocks and dirt. Does it get a blue sky like earth or is it perpetually that gray colour?

Here’s a 360 movie (view full screen) that shows the horizon in all its glory, this one was take with the MastCam-Z camera and IIRCit was the rover’s first MastCam 360 degree panorama in Jezero crater

Note the daytime colour of the sky :)

https://mastcamz.asu.edu/wp-content/uploads/2021/02/Mastcam-Z_Sol4_Horizon_Delta_720p.mp4