color chart? You mean this one?
COLOUR CHARTS
The top one looks like an all Feldgrau Krätzchen that someone sewed a red band on for some reason. Probably a collector.
The second one down is a Bavarian Einheits Krätzchen, which were made completely out of Feldgrau material, without a different color cloth for the band and top piping
The third one down with the black band and blue piping, looks like it is trying to be Kgl.Sächs. Karabiner-Regiment (2.Schweres Regiment) However, the colours are off. As is the rest of the cap I am afraid. The piping would be a very dark blue.
The Feldgrau one with the green band and piping looks like a Jäger officer's Schirmmütze that has had the visor ripped off.
The blue one with the yellow piping seems to be trying to be Kgl. Sächs. 1. Husaren-Regt. ,,König Albert'' Nr.18. But it looks odd. The piping should not go around the bottom of the cap, and the colour is off. I do not think that is an imperial German cap. Police or customs possibly from somewhere.