Ok, so in order of the pics, we're looking at flooring, acrylic tub surround and marble (granite?) top?
Are these all bought? Did you take a picture of these three elements in the same lighting? I ask because lighting is everything in how we perceive colour and on my monitor (which might not render the colours true), these elements aren't cohesive. The surround looks like a cool grey on my screen while the other two skew warm. All three have a pattern as well which usually makes a small space look busy.
That said, you have two horizontal applications (counter and floor) and one vertical (surround) so that will affect how we perceive the colours as well. Will you have a glass shower door or a curtain? If a glass shower door, I'd be tempted to find a colour that relates to the surround (I'd pick the lightest of the swirls). If you'll have a curtain and won't see the surround, I'd pick the lightest colour in your countertop. Bringing a sample to the paint store and having them match your element is one easy way to find that colour. (Both Sherwin-Williams and Benjamin Moore have phone apps that can help you identify their closest match colour to a hard surface.)
A greige colour is a chameleon colour that skews both warm and cool grey depending on the light and I'd be tempted to look at those. Benjamin Moore's Silver Satin might be a good one to try. Hope this helps.
Q