Picasso’s Blue Period was OK, we suppose, but we think green will be the color of choice for up-and-coming Philadelphia artists for the next 25 years or so. That’s the duration of the Philadelphia Water Department’s Green City, Clean Waters plan, the inspiration for a new art contest open to Philly students grades K-12. Students can submit a drawing, short video or both, portraying the ways in which we can protect our local waterways through environmentally friendly practices. The deadline for entries is February 24; prizes include gift cards, art supplies, certificates and calendars. Our friends at the Partnership for the Delaware Estuary are administering the contest; visit their site for more information and guidelines.