I’ve been toying with this #poetry constraint for many years, and thought I’d give it another go, using #haiku. Here are two which each use a palindrome of consonant sounds across the whole poem; vowel sounds are free:
I feel in sepia,
a fading lie, playing deaf:
a peace, no life.
All spring demands our eyes,
as a rose-idea, new,
muddying ripe soil.