Mixing it up is always advised, but in the transition to spring fashion in particular, a purely solid ensemble is just a waste: A great print can make almost anything seem reborn.
Half the time, all you need to go from "winter" to "sprinter" (yep, we said it again) is the right scarf.
Go for a one that's lightweight, knit or woven, and airy in a spring print. Floral, tribal or a pale-colored animal print will work wonders.
Loosely wrap it in an effortless drape when possible; if it's too cool for that, go snug. It'll still change the feel of your ensemble.