Ideas for Cursed Magic Items..

I'm working on a campaign centered in the desert, revolving around the theme of greed having consequences. However, I'm kind of in a creative rut as it comes to making good cursed items. By "good," I mean ones with real benefits that make the characters want to hold onto it, but which have tangible drawbacks (whether those be mechanical or narrative).
If anyone has ideas, I'd love to hear them!