I'm not super advanced in coding but i have an idea for a contraption if anyone else sees any use in it:

What about galleries? Like, having buttons on either side of an image that loads another image. i'm not sure what the right word to use is, but like... you know lazy susans? think like that but with images and in decker. I'm not sure if decker's limitations make this impossible but i feel like a lot of people would find this kind of thing useful, especially for e-zines like mine where i'm planning on adding tons of images and don't want to bloat the size due to one card being for one image some hundred images.

Hopefully it's plausible and not bloaty at the same time, but beggars can't be choosers- so chances are i'll take what i can get :P

Maybe it could be called like, cardception? i dunno

Sounds like the ImageEnum contraption might do what you have in mind, more or less. If you specifically wanted to display thumbnails of other existing cards you could write a script to populate the enum using "app.render[card]" to ask Decker to produce "screenshots" for you.