The red knights are based on an image I found of a British cavalry officer in 1745 (later the 4th Irish Horse, then the 7th Dragoon Guards.) I think they came out really well!
So I went for grey brick for the White rooks and brown for the Reds. I was tempted to put Fleur-de-lys and Union flags on them but I decided to keep it generic.
These are a bit more complex than the White (French) ones, but I've always liked the aesthetic of this period of British uniforms, so it was quite fun.