I was trying to think of Christmasy things that I hadn't seen on sweaters or t-shirts and snow globe came to mind. I think it because the glass encapsulating the snow is hard to show off in 2D especially when you have a limited colour pallet. So I went with a light blue outline for the glass and left the snow-white. I think I captured the effect quite well.
 
Chart shown in picture knitted on my adult chunky base sweater.
 
Yarn colours required - MC: Blue, CC1: Green, CC2: White, CC3: Brown, CC4: Yellow.