The 15mm pipes to my shower come through the bathroom ceiling. It looks a but untidy. I'm sure I've seen or heard of something looking like a sort of top hat that fits round the pipes and pushes into the hole to neaten it up but I can't find anything. Perhaps I'm not looking under the right name. I've tried "pipe trim" but that doesn't work.
You could use 15mm pipe covers that are used for radiator pipes coming through laminate flooring, you can get chrome ones from wickes for Â£2ish, they should stay in place, if not - nothing abit silicone wont solve.
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