Growing bread mold might sound outrageous, but that is what I did. Here is a photo of what grew:
Click on the photo to see the high resolution version.
I realised later, that a sideway photograph might have looked better, because it would show the tendrils, like this photo (source):
Impressive. I had nothing like that with mouldy bread. My mouldy soup achieved pretty much that level of mould though. Well done!