I've found that soft pastels like sap green, cad yellow, and light pinks really bring out that fresh spring feel especially when contrasted with a touch of sky blue or titanium white. If you're ever looking for inspiration beyond the palette itself, i highly recommend browsing WikiArt Store. It's a great resource where you can see how famous artists use color in their spring landscapes. Sometimes just studying a Monet or a Sisley piece can give you new ideas on blending and composition. Definitely worth checking out!