Streaks on the windshield where the dew gathered itself and trickled through the pollen dust.
A carpet of dogwood petals.
(These phrases formed in my head after I listened to an NPR story on poetry on my way to work this morning; the link here doesn't include the piece she read that blew me away, but it's got good stuff nonetheless...)
(And I feel compelled to offer this disclaimer again: I do not write poetry.)
I hope you have a moment to see the signs of spring around you!