Having trouble adding the view into the rest of the room but here it is.

If you want this to last and look nice, don't paint tile floors.

I would paint them because it is cheap and easy and adds a huge impact. If you decide you don't like them painted then I would spend money and some other type of flooring. As for those who say painted tile will not last, I painted my bathroom tile about 7 or 8 years ago and it still looks fantastic. Many people have painted tile here with great results.

The wallpaper looks fabulous!

I love your wallpaper. The tile looks to be in good condition and quite nice so I wouldn't suggest painting it. I love @Fori suggestion for rugs. It'll bring some warmth to your feet while you're working in there and be easy to change out if you decide to change the look in a few years.

IMO checker board with that wall paer would not be a good idea. BTW if you are painting the tile use Klenk it will last a very long time.

Your wallpaper is a hoot and I love the moody paint color. I vote for rugs and rug pads over your tile. I think a bit of the cream tile peeking out will be nice and tie it all together with your wallpaper.

Thanks to all who replied. @ilikefriday I have actually painted tile floors with great results and no wear and tear many years ago. Its just about using the right product. ('ive also used the wrong products on one and yes that looks terrible!).

Perhaps the floors would look better if I kept the same color tile but freshened up the grout? I did this in a bathroom (black floors with grey grout--they look like new floors now). I don't think black grout would work but any suggestions there? Right now the grout is just a dingy grey. They look dated and dirty.

@fori can you give me an example of the persian style you are picturing?

I am slowly steam cleaning all of the tile grout in my house. (There's a lot of tile.) The grout is going from dingy almost black to a nice clean cool gray. Only a few places where it's not coming out perfectly. You might give that a try if you're up for some DIY elbow grease effort. (I'm borrowing a friend's steam cleaner, but they're about $130 on Amazon.)

I've never painted tile floors but looks like some people have has success with that. So... I suggest you paint all the tiles the same dark green as the background of the wallpaper and then install matching natural fiber rugs, either 2 runners or a runner and an area rug to pick up on the leaves in the wallpaper.