As said, the speed blocks are very iconic.
Here's two colour schemes that I did on some RD's I had. The mellow yellow was originally silver and the red and white one is a copy of the earlier TZ Yamahas.
I wouldn't say that the colourways and design are going to give you anything unique.
The Roberts style flat tracker does look neat though. As does Nicks bike, and to some extent Gassitt's. I will say that, from experience, that particular attention need to be paid to designs that flow across all bike panels as lines need to flow and be balanced. I've seen some awful renditions of the speed block design that just don't work.