cement-ish shower floor

this might be a stupid question, but from what i've read on this board all the mortar shower pans finish with a final layer of tile. sloped mortar > membrane > final mortar > tile.
what if i just want the cement look? kinda loft-industrial look. no tile.
anyone know how this is done? or is a matter of just not tiling. anyone have a link?
much thanks
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