For a serene and rustic St. Patrick's Day design suitable for prints, envision a composition that harmoniously blends the tranquil beauty of the Irish countryside with traditional symbols of the holiday. Begin with a background of rolling, emerald-green hills gently fading into a misty horizon, invoking a sense of peace and natural splendor. Overlay this with subtle, vintage textures to give it an aged, timeless quality. Center the design around a classic, weathered wooden sign, perhaps reclaimed from an old Irish pub, hanging from a wrought iron bracket. This sign is the focal point, painted in distressed greens and golds, featuring elegantly handwritten script that reads "Happy St. Patrick's Day." Flanking the sign, include delicate illustrations of shamrocks and Celtic knots, their intricate lines softly blending with the rustic background. Incorporate elements like a rustic, old-fashioned lantern casting a warm, inviting glow, and a pair of crossed, antique-looking shillelaghs to frame the sign, adding a touch of Irish folklore. The overall effect should be one of warmth, nostalgia, and a connection to the Irish heritage, making it an ideal design for St. Patrick's Day prints that evoke a sense of calm and tradition.