I like the wallpaper. I’m with Patricia as I wouldn’t see a need for anything under the cabinet. You can do floating shelves as well as artwork to fill up the space.

Three more ideas and you’ll have to combine the two ideas into one pleasing arrangement.

I think the light grey cabinets are a bit understated and if you painted them darker grey or black and perhaps took off the doors and added something fun on the wall that area will really draw the eye. I also wonder if it’s high enough and perhaps open shelving will help balance. .

Yes, the wallpaper would look best if only used on the back wall and not on the side walls or underneath cabinets. Are you up to changing that?
If the cabinets are actually too low for a coffee bar, that area would be great for wall to wall floating shelves styled with books, cherished decor items, plants etc and then you could still put regular bar items and drinking glasses on trays on surface of cabinets.

Thanks everyone!!

yes, remove side portion. have you though getting a piece of white quartz (or marble) for the top of your cabinet? I think it would look better.

see this one? (also notice no side wall paper)

hard to photo shop. I'd do a simple white or gray top

you could also do open backed glass cabinets. the wall paper would show through the glass