Step 1: Paint the jar top with a "Christmasy" colour of your choice, red, green, metallic...I chose gold since that was a paint colour I had on hand and it's a colour commonly used to decorate at Christmas time. I just picked up that paint at the Dollar store. Paint at least 2 coats to ensure the boring original silver and any writing on the jar top is fully covered.
Step 2: Cut the photo you intend to use into a circle that will fit the jar ornament. Make sure the photo you choose makes sense with the size of the jar top. The faces should be a good size so you can see them from far away, so not to small or too large.
Step 3: After you have let the paint dry fully, fill up the jar top with something you have on hand, such as a few pieces of cardboard or pieces of folded paper, etc. I used a piece of styrofoam that I cut to fit the jar top. After filling up the jar top up to the rim, spread some glue on it.
Step 4: Glue the photo on the jar top. In order for the photo to fully adhere I put something heavy like a book on top of the ornament and waited about an hour before going to the next step.
Step 5: I glued some small coloured "bling" around the edge of the ornament to partially frame it. I used red and green Christmas colours.
Step 6\: Cut a piece of ribbon that is long enough to wrap around the jar top and have some ribbon leftover to create a loop that can help you hang the ornament on the tree. I added a small bell to make the loop look more festive when it is on the tree.