It is a bathroom floor in good conditions but the color is wrong. Should I paint it, remove it, or put vinyl tiles over it?
I would not recommend painting it. The paint will scratch and chip off very easily. I would remove it, and if the sub-floor is in good shape, then I'd put vinyl tiles on.
If ceramic are glass type ,instruction is nothing .If the ceramics are floor tiles with relief surface ,1-Anti grease them with purple degrease and then paint it with epoxy colors (type that use for pool or garage floor).