How Can I Be All Of These?

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

Answer: Fingernails.

Source: https://www.riddles.com/index.php/5468

I can be long, or I can be short. I can be grown, or I can be bought. I can be painted, or left bare. I can be round or I can be square. What am I? — How can I be all of these? by Llama Walsh v1.

Riddle: I can be long, or I can be short. I can be grown, or I can be bought. I can be painted, or left bare. I can be round or I can be square. What am I? Answer: Fingernails. — by Llama Walsh v2.