You definitely cannot do gray colors with that flooring. You have to stick with warmer tones. Just stick with a neutral light cream color for paint. Then remove that white standing cabinet and whatever is hanging over the toilet. And then get a solid cream colored piece of fabric to hang in front of a plastic shower curtain and hang it from the ceiling all the way to the floor. Remove that rug. Hang nice white towels. Hang some art work. I can't see the sink or the lighting above it, but make sure that is nice. And then hang a small chandelier if you can.

You are absolutely right not to fight your tile. The rendition on the computer is hard to see clearly, but the veining in it suggests some shades of charcoal and mushroom. I would use those as your guide to a wall color. Your current shower curtain seems to have grey, brown, and blue/ green (hint of yellow as in the floor tile) - that could be your color scheme. Fluffy blue-ish towels and decorative items for the white storage unit would pull it all together. Some examples of color palettes:

Try a white that works with the grout and the fixture colors....then accessorize with a shower curtain that has a white background and a fun color; add more color. Actually you can keep your shower curtain and have the white background relate to the white on the walls and use the colors in the shower curtain and accent with aqua, grey, green , what ever color you prefer from your shower curtains.

You might also get rid of the tower and choose something shorter and then put floating shelves over the toilet for more open storage.

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