A brain wallet (also not recommended) could work from photos and other objects too: on the wall in my living room from left to right I see: Heater Speaker Bob Alice TV Speaker Fireplace Wedding Lamborghini Piggybank Drawer Litterbox and Curtain. Enter it into Bitaddress: 1pZNXZ6PUfpHjmgcQhcYkEVJnMStJfj7C!
As long as you don't change your living room, you can probably recover these funds. But it's not the most secure storage system.
Indeed. But is it not-so-safe because the list of English words, or is it because they're objects in your house? I mean that if one uses this "trick" with a list of (image) files, somebody else will also have to know that the seed comes from a list of files. I'd guess that the hash of a number of files can give stronger seed than from some words, but I am not good at this.