I have a pink pencil.
You (singular/informal) have a white book.
He has a red pen.
We (informal) have/One has a blue chair.
We (formal) have a yellow eraser
You (plural/formal) have a black trashcan.
They (m) have an orange pencil case.
I have some (des) green pens.
She has some (des) white brushes.
They (m) have some (des) purple books.