It think these are perler beads! Awesome Super Mario perler fridge magnets - planned out specifically to create a great scene on the fridge doors.
Free Perler Bead Patterns for Kids! Would work great for a cross stitch pattern as well.
Rainbow Star Perler Bead Pattern but this would be cool for a granny square design also using smaller blocks.
Items similar to Set of 4 perler bead donut coasters on Etsy
Melting Heart Pixel Perler Bead by BlackOutDoll
Ice Cream Collection Hama beads by margarita
Hama Easter decorations hama pb by barnslig_interior
Attrappe-rêve grand modéle - Dreamcatcher hama perler by Alice Tobbi - Magic…
In the UK these are hama beads, the type that all mums dread because kids forget the baking paper and they get stuck to the iron.
Kawaii hamburger fries magnet set perler beads by daynaperlers