I'm the coolest. But add a letter to my start and I become: Something that makes your head itch. Roll us and we might make you rich. A rhyme about three unable to see, Crockett and Tubbs in Miami. What am I ?

I’m above your head, yet out of your sight, where forgotten treasures sleep day and night.

In the framework of life, I quietly dwell, Hidden beneath, where stories to tell. Strong as iron, yet I never boast, I'm the ghostly host.

I have no voice, yet I unlock secrets. I have a single eye, but I am completely blind. What am I?

On the outside, I am blue. But if you remove my skin I become green. Crush me, and I turn purple. What am I?