What do you mean by frames?
Please post a picture of your fireplace so that we can see what you are starting with.
Please post Pictures, It would help. Do you mean the fireplace is wooden and you wish to update it?
Are you referring to the hearth? If so you can replace or perhaps paint, depending on what material it is. If you are referring to the hood, it can be painted as well with a heat resistant paint.
Here's a collection of fireplace update projects that might help you:
If there brass clean the brass with brasso cleaner it cleans nice or paint the brass