Similar Sound, Not Perfect Rhyme:
* Elves cake and bake (rhymes "break" with "bake")
* Elves fairy tale (rhymes "break" with "tale")
* Elves forest lake (rhymes "break" with "lake")
Wordplay/Humor:
* Elves, mischief awake (plays on the idea of elves being mischievous)
* Elves, their magic to make (a bit more poetic)
Less Obvious, But Works:
* Elves, a moment to take (rhymes "break" with "take")
Ultimately, the best rhyming word pair will depend on the context of your sentence and the tone you're trying to achieve!