Just two possible variants, that would overcome the A20's serious lack of colour:
Ch-130, Ad Astra Aero
The plane made in 1924 a 6000km journey from Switzerland to Iraq and Iran. It started in floatplane configuration and was changed to landplane configuration in Smyrna (Turkey):
Junkers.de | Kalenderblatt Nr. 12: Walter Mittelholzer
Junkers.de | Kalenderblatt Nr. 15: Mittelholzers Persienflug
ETH Zürich - ETH-Bibliothek - E-PICS - ETHBIB.Bildarchiv - Ans_05035-503
Undoubtly, the most colourful version is the licence-built, sovjet A20 (called Ju 20):
Junkers Ju.20
Junkers Ju 20 Side view // by Basil Zolotov
(An interesting site about the VVS colours, in particular:
Modeling the Aircraft of the Soviet VVS)
Michi
P.S.:
My A20 is well on its way - shouldn't take too long till it's finished!