Answer:
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
Things here are usually tagged with red stickers.
I can be entertaining until you realize some pieces have been lost.
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls
Who plays when he works and works when he plays?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.