Ann to cover your block tiles I assume they are the clear ones. Why do you want to cover them?
If for privacy maybe paint would work.
A design or solid. If they are the clear ones just be aware that if you do cover or paint them, and these were used for light you’re going to obviously get rid of the light.
If this is a shower enclosure can you hang material
like a curtain over it?
You could tie it back if you wanted to as well.
You can buy decals for tiles that are like stickers that you put right over the old tiles. Check out Home Depot.
I covered the old tiles in my bathroom and it was so easy. You can see how here: https://thehoneycombhome.com/floor-stickers-in-the-bathroom/
I just pained my bathroom tiles, so this is an option! Here's the tutorial for you: https://www.youtube.com/watch?v=Zhct4NvU_lI