I am really not happy with the Gridmarket Theme

I am really not happy with the Gridmarket Theme. It really isn't designed to look like a pinboard, nor can you do much with it.

Can I use the "Themify Theme Pinboard", Or is that allowed. I need it for my ecommerce site, not for blogging.

Will all my plugins work with this theme? Can I still us it as a etsy style for customers to register and pay.

Regards,

Brenda