I know DnD is rife with them, but come up with the personality of a favorite archmage and produce a few cards of things he would make, like 'Guzzi's neverspill tankard' that will only empty its contents when supped or poured intentionally, or his picnic basket that produces one meal every day; say a pint of wine, hunk of bread, cheese, and a bit of ham.
A fry pan with a rune for fire on the bottom, when rapped soundly against a rock it heats up to cooking temperature for an hour. after you're done, rapping it again will cool it down. It must be cleaned normally.
I've also given to my players, not cursed items, per se, but "factory seconds?" I mean, with all the magic items being cranked out in the world, there's got to be some goofs occasionally. My favorite is the invisible ring, that's it just an invisible ring. Nobody even knows what it's made of.
Steve