Here are some rhyme without reason costume ideas for a group of three:

1. Indiana Jones and Traffic Cones
   • One person dresses as Indiana Jones
   • The other two wear bright orange safety cone costumes
2. Racecar, Superstar, Acoustic Guitar
   • Each person dresses according to their interest: racecar, superstar, or acoustic guitar
3. Hoedown and Showdown
   • One person dresses as a cowboy to the hoedown
   • The other two pretend to be in a guns-a-blazin’ fight with each other
4. Tooth Fairy, Strawberry, Katy Perry
   • One dresses as the tooth fairy
   • Another as a sweet red strawberry
   • The third as pop star Katy Perry
5. Wizard, Lizard, and Blizzard
   • One as a mystical sorcerer (wizard)
   • One as a scaly reptile (lizard)
   • One as an icy storm (blizzard)
6. Chef, Ref, and Jeff
   • One as a chef with a tall white hat
   • One as a referee
   • One as "Jeff" (any character named Jeff)

These ideas are playful and creative without a strict rhyme logic, perfect for a rhyme without reason costume theme party for three people.

Additionally, here are some rhyming words for "without" that may inspire costume themes:

• doubt, shout, scout, trout, clout, pout, sprout, stout, route, spout, bout.

If a rhyme approach is preferred, these rhymes could also inspire costume combinations.