These are easy and require no new features in the environment.

Extra Large -- <span class="label">Extra Large</span>

That worked!! -- <span class="label success">That worked!!</span>

Boots on the ground -- <span class="label warning">Boots on the ground</span>

That didn't work -- <span class="label important">That didn't work</span>

Happy New Year -- <span class="label notice">Happy New Year</span>