<p>The <a href="http://www.gelousy.com">Gelousy</a> f/x collection consists of eight gels that go on nearly clear, but change the color you put them over (you can only see their true colors if you apply them over black). Each of the collection&rsquo;s gels&nbsp;has three different colors in it, so the nail color also changes depending on the viewing angle.</p>