i have to do a 30 sec animation in opengl

(windows) not on a very high standard.
my problem is that i lack imagination, so where could i find animations that are easy to implement. thanx

You question is badly asked.
Either you’re wandering what content you should put in your demo, and if this is the case, you’re on the wrong forum.
Either you want to know what can be easily done in OGL, and if this is the case, then you should ask for this, and you should present what you already know.