My intent was to do some proper vector designs and exploration for this but haven’t had much free time lately so I’ll just post some of the sketches I made, if anyone sees any value there just go ahead and use them. 
My main rationale for those sketches is at the top of the page, basically the cycle icon, the letter C and the Shader ball commonly used to test shaders. While sketching I was always thinking of making the main form of the logo in 3D, using a sphere or torus as a base, and then just vectorize it using flat colors to maintain readability and respect the guidelines of logo design.
