Firstly create a template so children can draw around it on a piece of cardboard (an old cardboard box is perfect).
Children then cut out the cardboard shape with scissors, and use a hole punch to make a hole at the top.
An assortment of colourful seeds (beans, peas, rice, lentils etc.) can be glued on with PVA glue to make a pattern.
This is a great use for seeds which are past their use-by date, or weevil infected. Once dry, a piece of string or ribbon can be tied through the hole so the heart can be hung.
This is a fun, inexpensive, nature craft activity for a whole class. Try it!