One of the biggest things for spring is going to be pastel-ish florals! How sweet and romantic! But, it is very classic, can come in interesting cuts and fabrics and even some neat colors. Also, don't be surprised to see some of the more edgy designers come out with prints that have bugs and stuff in with the flowers.
A great example of this is the dress pictured by Alice + Olivia. It is 100% silk with a bright pop of color with the belt. The print is everything that the season is about--it is soft, floral and even has a creamy-white background. The dress is a great, happy spring dress!
Picture from net-a-porter.com