Just as there is a rainbow 395, there is now a rainbow ICE which sould be good to see Another livery variation is the Euro ICE It would also be cool to see the 403 and 406 with each other's liveries, just for variety. Another 406 variant is with the NS logo but I know you've never licensed NS before
It would be really awesome to have some kind of a collection of different coloured ICE to choose from.
More liveries like these could be great. I made a more comprehensive list that also includes different German trains a while ago. I think more liveries would make good mastery or community challenge rewards, not just for Germany but for all nations in game. To me having more liveries (that look like the real deal, unlike what I can make in the livery editor) is just great as it offers variety in what you can play amd see on AI traffic.
They did. https://store.steampowered.com/app/65249/Train_Simulator_DB_Freight_1970s_Loco_AddOn/ Look at those wagons