If New Jersey were a paint-covered canvas, with each color representing a paint-and-sip studio, it would resemble Jackson Pollock splatters everywhere. During the past decade, a wave of indie and franchise spots has roared down our main streets. They offer easy access to acrylics, canvas and gentle instruction: no creative talent required. Pinot’s Palette. ArteVino. Canvas & Grapes. The list goes on, and the camaraderie, booze and grown-up play have clearly struck a nerve.