Answer:
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
I'm found on Windows yet I am just a decoration. What am I?
Draw fire or fill me; I'm still empty.
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
Iām white; perfect for cutting & grinding. For most animals I am a useful tool.
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.