We mixed up some salt dough 1 cup salt, 2 cups flour, 1 cup hot water- mix well.
Roll out some dough.
Cut out hearts. I got the heart cookie cutters at Dollar Tree.
Let your hearts dry. I tried letting them air dry but after a day they were not dry so I put the in a 200 degree F oven for an hour. I didn't want to go any hotter them that for fear I might melt the plastic decorations.
After the were dry I added a generous coating of Mod Podge. I had to stick some of the treasures that fell off back on too. Let the Mod Podge dry and hot glued on heavy duty magnets.