I am looking for possible disc rotors for the GRX 2x11 that comes with the GRX BR-RX810 brakes but can just find one recommendation which are the Shimano Ultegra SM-RT800 Center Lock Ice-Tech, that I find very ugly. Even on the Shimano page I cannot find anything else. Are there any other rotors that are compatible with the GRX BR-RX810 and GRX2x11?
If you want to stick with Shimano, the line-up charts for the GRX groups suggest an SM-RT64, SM-RT70 and RT-MT800 for use with RX400 and RX600 and RX810 groups respectively. None of those discs have the 'bladed' look of the SM-RT800 rotor.
In all honesty, you can use any disc you like, and from practically any manufacturer as long as the dia. (and fitment type) is the same.