https://www.prowheelbuilder.com/rims.../blue_red.html
Prowheelbuilder.com has some Velocity rims in red and blue (limited selection).
Or you can go to velocityusa.com and I think they will custom anodize any of their rims as a special order.
edit: $30 for custom anodize:
https://www.velocityusa.com/tech/colors/
For a rim brake roadie I'd look at the Quill and the A23 - both tubeless compatible.