When opening a geo-file for the first time in QGIS, random colors are assigned to the points, lines, and polygons. QGIS offers excellent features to design and use color style schemes. This article describes how to do this, with the objective as follows:

I was just seven years old when someone gave me the special topographic edition of the Walcheren map (scale 1:25,000), which completely blew me away. My general love for graphic design expanded with a passion for cartographic styling. So, when Kadaster (the Dutch national mapping agency) finally offered their famous dataset “Top10NL” (meaning: Netherlands vectorized at a nominal scale of 1:10,000) for free (as GML files), I was in a state of total bliss. At last I was able to style the famous topographic Dutch map with my own color styles. Moreover, QGIS directly reads GML files, so I thought this was going to be an easy job.
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