Needed: Funny pdp8/e (plotter) demo software!

Hi folks, we'll have an event here in Kiel on Friday night ("Museumsnacht") where my bosses decided (to be fair... I steered into that direction as best I could) to present a snippet of the Kiel collection. I'll be standing around in a corner with a pdp8/e. Equipped with 2 RK05, TU56, VT05, PC04, and CalComp 565 (0.1mm/step variant). I'm still looking for funny stuff to present. I'm running short on time and would be very happy to get some hints to nice graphic programs and other toys. I have some BASIC games from the net. That's not too much. There *must* be funny software involving the plotter somewhere out in the world! The best would be something that allows me to create little souvenirs for the more interested people. And something that draws complex stuff and takes long time. I have no clue about BASIC plotter support. I can use PAL sources (if there's no need for extra plotter code), BASIC, and FORTRAN IV. I have the plotter routines installed and working. Everything is installed and working. BTW the local VT05 didn't come up today. No high voltage. I looked around a bit and gave it up. But I needed the VT05 to blindly command the 8/e while doing file transfers from my notebook. And after some two hours - it started. And is running stable since then - with better image than before. I really hope that this isn't the "clear mind before dead"... Best wishes, Philipp :-)