Your thumb is never gonna be green. But the rest of your body can. Dig the dirt out of those fingernails and book one of these ecofriendly beauty treatments. Through April 30, Hiatus Spa + Retreat is offering a full-body experience — head-to-toe polish, Vichy shower, scalp massage — topped off with a lavender-vodka lemonade and Aveda Light the Way candle, which supports clean water projects via the Global Greengrants Fund. The Spa at The Stoneleigh not only uses green products for treatments (we love the sunless organic tanning app) but sells them, too. Snaps for SpaRitual vegan nail care and Eminence, an organic skin care label that uses 100 percent recyclable packaging and makes deliveries via hybrid vehicles. Everything at Spa Habitat is eco — from treatments to cleaning supplies to decor. Through April 30, a 35-minute Little Green facial or massage costs only $49 Monday-Thursday. Calling all Bliss junkies: Next Wednesday (Earth Day), take in one of the spa’s signature blue totes and get 20 percent off Laboratoire Remède and in-house products. Then head to Exhale Spa, 9 a.m.-2 p.m., to score free minifacials or hand massages (one per person) with the retreat’s exclusive paraben-free line, GRN. All of which call for two thumbs up.