Sometimes after a couple of minutes, sometimes hours, or days, I realized a nice drawing (most of them for math, sometimes physics). But I want to share (give things back to the forum) my work (and the work of others). Is there a place where this can be done. Not like a question, but just giving the code and a screenshot of an example.
you may first try to think why your specific example of code/graphic is important to be shared with others. I am sure there are plenty of such cases since I spend daily some hours on reading code of other people to learn new things. simple because a graphic looks nice is not enough and will cause spamming but if there is a specific trick or algorithm inside what is unique then it is worth sharing.
having clear why it is important to share you may create a question to how to do it. then you may answer your own question. it is not forbidden.
I believe you having an account on GitHub would be very good. GitHub is a platform hosting code for version control and collaboration.