What am I?

I can be long, or I can be short. I can be grown, and I can be bought. I can be painted, or left bare. I can be round, or square. What am I?

related riddles

I move without wings, Between silken string, I leave as you find, My substance behind. What am I?

I am a lunch money thief. What am I?

I am commonly abbreviated to H. What am I?