Wow! You really like bold colors! They're all beautiful but I don't think I'd use them more than halfway up the wall, and a neutral white on the upper half.

I think you'll find such bright colors overwhelming, especially if the bathroom is small. I'd vote for a more neutral color on the walls/trim and adding color with towels and decor, which are easy and inexpensive to change. If you plan on selling in the future, you'd have to change to a more neutral color anyway to appeal to buyers. Or, you could add wainscoting on the lower 1/3 of the wall and wallpaper or paint above.

If you like these colors, pick one. I would go with either the green or purple and paint the cabinet white and the trim white. It will look beautiful. I know you didn't ask, but I think you should lower that towel bar down. It is too high.