Pretty pictures cut from magazines, calendars or holiday cards are other items that make great wall art. Pressed flowers and leaves are beautiful framed. Outdoors, try to find flowers or leaves that are naturally flat and will lie between paper well, then press them between pages in a book. After a week or more, check to see if they're dry and crisp to the touch. Frame crocheted doilies on a contrasting background for a beautiful picture.
Hankies are another item that's easily framed.
These are really special if the item belonged to a family member. Save memorabilia from vacations such as ticket stubs, menus, napkins, pictures or other flat surface items and frame these for a unique picture that brings memories and conversation. For a garden look, a pretty seed packet could be framed with a complimentary background. Hot glue small pinecones or other natural material to the frame to finish it off. If you don't have a pretty seed packet, you could cut a pretty garden picture from a magazine or birthday card.