Yep, next one on the bench is the black rose. I will skip the Taal templars though, these are relics in my version of the Empire. (Although I can see a conversion using the horns of the stags sold by Eureka for their wood elf 10 mm range).
You can get a couple of drawings of the black rose in the book on heralrdy of the Empire, and also, well hidden, in the Warhammer Role Playing Game 4th edition - But both images differs: they are entirely black, horse barding, armor and lance, with white horses and red plumes in the RPG; Black barding, red lance, steel armor in the Heraldry one. Still undecided. The banner is lovely but will be difficult.
The panthers will follow, but I think I may not use the standard blue theme. Panthers are black and yellow after all. The challenge will be to differentiate them from the blazing sun...