More stupid curses for your Dungeons & Dragons game:
Having robbed a leprechaun’s hoard, the party are now themselves at the end of the rainbow. Constantly having a rainbow pointing out your exact location is more troublesome than you’d think!
Having interrupted a rite to a goddess of the hearth, the party has been “blessed” with an aura of deliciousness. It doesn’t specifically compel anyone to want to eat them; it just gives them the unaccountable certainty that if they did, it’d be the best meal they’ve ever had
Having done a favour for an evil dragon who always repays her debts but resents having to do so, the party has been granted the loyal service of a mob of enthusiastically incompetent kobolds who always show up again no matter how many times they’re seemingly lost or killed
Having insulted the god of wealth, the party has been stricken with the absolute inability to tell gold pieces from copper, or vice versa; worse, the curse is contagious and afflicts anyone who tries to help them with their finances, even under duress
Having consumed expired healing potions, the party’s blood has developed healing properties; once word of their condition gets around, they quickly find themselves hunted by parties of rival adventurers who wish to harvest their precious bodily fluids!