You must find a good resolution, tile-able image (or create one from a photo) of the concrete that you show... which shows both the form marks as well as the blotches of color.
With other rendering packages outside of ArchiCAD, you might instead apply several shaders on top of one another at different scales to get the effect that you show. But, ArchiCAD pretty much deals with a single texture image. You can use the Lightworks engine to generate the regular bump of the form lines... and then overlay a blotchy color image through. (Some of the color in your image aligns with the horizontal form lines... and that wouldn't be possible with a random overlay.)
Noemi Balogh
