Place the domes on scrap pieces of paper and trace with a pencil.
Cut the paper out just inside the lines using scissors.
Place a medium layer of Mod Podge on the top of the scrapbook paper, then place the dome down and press/smooth. If Mod Podge comes out the sides, wipe it away with your brush.
Repeat with all of your glass cabochons and let the paper dry for a few hours.
Glue one magnet to the back of each one. Let dry.
Trace the mason jar lid on scrapbook paper. Cut out the insert and place inside the lid.
Place the magnets in the jar and screw on the top to gift.