If you want to put it on just a plaque and not use a picture frame. I useed this method to make wooden scrapbooks for Adult craft in vacation bible school.
1. If using unfinished wook, sand the wood and finish the wood with paint or your choice of stain or varnish.
2. Let it dry completely following the directions on the stain, paint. or varnish.
3. Using MOD PODGE( available at craft stores or Wal-Mart) coat the back of the invitation and place it where you want on the plaque. Since it pribably also has an inside view, you may want to cut it apart and arrange the two pieces on the wood. You could actually put a corner over another corner to make it easier on the eyes. After you have the pieces on the wood. coat the top with the PODGE.
4. After this is completely dry, you can add a clear coat to the whole piece for extra pritection,, or a very light color varnish to give the piece an antique look.
Hope this helps and enjoy your prokect.
