I've made a few of these as doodles while waiting for other stuff. Great set of restrictions to inspire creativity.

X Plus Star https://tixy.land/?code=%28sin%28t*0.8*-sqrt%28%28x-7.5%29**...

Sin Sin https://tixy.land/?code=sin%28sin%28i*sin%28t%2F10%29%29%29

Traffic https://tixy.land/?code=sin%28i*i*t*0.0005%29