Is there some sort of citizen science we could engage-in with these datasets? When zooming in on Euclid’s view of the Perseus cluster of galaxies I see some very strange stuff :-)
The fun thing is that when a group gets scope time, it's typically for a specific purpose so the images are initially studied specifically for that purpose. It's possible there's more treasure in those images beyond the original intent that just needs more time being studied or added to other imagery/collections that come together to reveal something.
So depending on what you might be interested in, you can find all of the images from every scope imaginable of the same object to do some fun stuff, or you could find a time series from one scope that might reveal something.