1) 4e: Divinely blessed Basket of Everlasting Provisions.
Not only do "you get a full meal", but you can describe it a little and create a fact for the world you play in.
- Basket produces food that is easily grown in -Deity's- Holy Land
- On holy days, you get a meal with ceremonial significance (Easter eggs)
- Punishment rations might be bread and milk. You committed a grievous sin and must atone. Guess what you are served until you take care of unfinished business?
- Provides fish on Fridays during Lent. Even if you are in the desert.
2) "Fire extinguisher" - lets anybody cast Ray of Cold but covers an entire square and does only 1 HP damage. Puts out fires too.
3) Arrow of Unerring Aim - for when you just have to channel your inner Legolas. Treat an arrow as a one-shot Magic Missile instead.
4) Magically-enhanced cone of rolled-up paper that acts as a megaphone. Don't give it to the Bard, or to anybody who can cast Thunderwave.
5) Message with a focus lends itself to a pair of walkie-talkies (for us grognards) or an email app on cell phones (for the young whippersnappers).
Any other cantrip with a focus, and the irony / whimsy displayed by the Material Components list, can lead to a fun magic item that people remember for years to come.