Colour some clean sand by mixing it with powdered food dye or paint and then pour into small containers with holes poked through the lids. Labelling each container with a coloured sticker or mark will help the children work out which colour is in each container.
Pour some glue into shallow containers and provide a variety of glue brushes for children to use. As white glue on white paper can be difficult to see, you may like to add a little paint or food colouring.
Provide some thick paper or card for the children to paint on with the glue. While the glue is still wet and sticky, the children can shake the sand over their design. The excess sand can be shaken off into newspaper or into a large container, and recycled.
You should make coloured and/or black paper available for more creative sand painting explorations.