You will need:
Various colors of felt, use up small scraps if you have them.
You can glue on the sequins but I think it’s a lot easier to sew them on- less messy glue gun web and burned fingers but, if you’re skilled with the hot glue gun it’s definitely an option here. When stacking sequins, use a bead at the top to hold all the sequins in place. Bring the needle up through the sequins and bead then past the bead and back through the sequins and felt.
On a few of the hearts, I tacked down the edges with a thread or embroidery floss whip stitch. I like the embroidered look but couldn’t help still adding a little sparkle every time.
Magnets (like the one’s pictured here) can be purchased at craft store (maybe even hardware stores too) in various sizes and strengths. Make sure you get the strongest magnets, nobody like precious papers and pictures falling off the fridge when you breeze past.
Good luck and enjoy!