I prepare the backs of the available paintings by attaching a wood brace, eye hooks and hanging wire, no framing necessary. They stand out from the wall between 1/4 - 1/2 inches, are gessoed on both sides in warm white and signed in pencil at the back of the panel. The brace is removable if desired because it's adhesed using a silicone gel. Here are some examples that show the look of the side and back of the currently available work, which you can find in my gallery pages.
For the smallest works in the Miniature Paintings and Drawings Gallery, I have put a magnet at the back of the painting, so they can be hung on a fridge or a metal filing cabinet, bulletin board, etc.