<p>Well, these tags are well documented in wiki and there are many such tags in use in the DB:</p>
<ul>
<li><a href="https://taginfo.openstreetmap.org/keys/?key=colour#values" rel="nofollow">https://taginfo.openstreetmap.org/keys/?key=colour#values</a></li>
<li><a href="https://taginfo.openstreetmap.org/keys/?key=building%3Acolour#values" rel="nofollow">https://taginfo.openstreetmap.org/keys/?key=building%3Acolour#values</a></li>
<li><a href="https://taginfo.openstreetmap.org/keys/?key=ref%3Acolour#values" rel="nofollow">https://taginfo.openstreetmap.org/keys/?key=ref%3Acolour#values</a></li>
<li><a href="https://taginfo.openstreetmap.org/keys/?key=roof%3Acolour#values" rel="nofollow">https://taginfo.openstreetmap.org/keys/?key=roof%3Acolour#values</a></li>
</ul>

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