I have been getting questions about my recommendations for framing, which I appreciate as I have seen some of works framed in a way that detracts from the piece.
Drawings and Limited edition block prints should be framed as they have a fragile surface and need to be covered with either glass or a comparable protective clear surface. My favorite is a shadow box white wood frame. This is my favorite ready made frame. My second favorite way to frame a drawing or limited edition print is mounted by sandwiching between two larger pieces of glass.
Many limited edition prints are made on a standard size and will do fine with a ready made frame. Gallery wrapped oil paintings do not have to be framed and I think they typically look best not framed. However if you would like to frame an oil work, it will have to be custom and I would still recommend a shadow box white wood frame.