This is a parametric filament guide to judge the color of a type of filament at given thicknesses.  This model has space for a "tag" so that the filament supplier and color can be written on the swatch.  It has a hole so that multiple swatches can be combined with a bolt or keyring.  
You can control the length, step thickness, number of steps, etc.  
For example, if you wanted samples between 1-10mm, this is easy to generate with this swatch.