Here are a few of my favorite creations so far:

https://michae2.github.io/c-turtl/?dna=pfrbpplfpfpppcfppcfpc...

https://michae2.github.io/c-turtl/?dna=ffffffpffffffffpfffff...

https://michae2.github.io/c-turtl/?dna=pfrblffffffffffffplll...