This is a revision of this table. I added a column for traditional fantasy magic as suggested by a commenter. Some of these are quite potent, but you can skip the column altogether if you want.
I also added the bare bones of a value system. I was thinking of making the items worth a base value of 500 gp (or sp if on a silver economy) and each - or + is a d20 roll. The results of those rolls are multiplied by 100 to give you gp values to add or subtract. I'm trying to keep things as simple as possible. So, that should give a potential value of 8500 if you get lucky. I would probably put a lower limit of 10 or 20gp even if the item is crude and broken. They are supposed to be of some value after all.
What do you think? Are the values too low? Too swingy?
I wouldn't use this to handle all my magic item needs. I like making unique ones too much. But this could be a handy way to quickly get a central treasure to place in a small dungeon.
I went back and made some revisions, including replacing fur cloak with leather saddle. I was thinking spurs might be a good possibility as well, but went with saddle to use leather as a material. I think leather is stiff enough to function as symbolic swords and coffers and such. I also replaced hair with iron as a material.
I tried to make a couple more magical properties more abstract so as to work better with the other item possibilities. The coffer holding more than it should is still a little too specific, but I thought it could also be understood as "expands to necessary size" for some of the items like ring, sword, helm, etc.
I want to make a separate clothing item table now with cloaks and hats made of fur and feathers and such. I don't think I can stretch it to 20 entries maybe 6 would be enough.