Still on the lookout for lemonade stands, I came across this unique concept in Larchmont Village yesterday: Lemonade and Art. Two small children, under the watchful eye of their father, were selling lemonade and art. For seventy-five cents, I had a very good glass of juice and a folded triptych with a beautiful yellow sun at the top. Customers seemed a bit scarce. They may have to think about a new marketing plan.