Pick a living visual, tune the color, motion and text live, then copy one URL into an OBS Browser source. No account needed — your settings ride in the link.
In OBS: + → Browser, paste this URL, set 1920×1080, and check “Shutdown source when not visible” off. That's it.
Saves these settings to a channel so the plain link ?login=<channel> always shows them — editable later without changing the OBS URL. Requires the ops key.