Something Biblical in scale, like the full page panel of the still smoking body of the Silver Surfer having just been granted the power cosmic by the giant hand of Galactus. that's the first thing that popped into my mind, anyway.
Maybe Flash 123, with both Barry and Jay rushing to save the dude in the center?
Or the central figures of Crisis 7, considering the pose is already a religious imagery.
Any of them would, but I don't have the skill just yet.
How about Silver Surfer 4 (Thor Vs Mephisto)
and would the Angel on the cover of Marvels 2 be a tad too 'religious'?
What about that panel of the Surfer turning Quasimodo into a humanoid in FF Annual#5? I used to have a black light poster of that.
subject matter doesn't seem to matter. I'm going to come up with different designs and the teacher will help me decide which one to go with. So far I've got the Pythagorean theorem and Rose Quartz's shield from Steven Universe and the schematic for a vacuum tube voltmeter. Converting the pictures into a pattern for a window is Thursday's class.
If you want something comic book releated specifically to use in your class, you might consider something simpler such as the FF logo.
The logo would be interesting to try. Maybe the masthead. My favorite was always the 1970's version where you had all four members and the name at the top of the cover. Come to think of it the Thing would be the most reproducible in stained glass.