We also made glue and salt pictures. I transferred wood glue into these little bottles with spouts for easier drawing. You can also use a paintbrush and paint the glue pic too whichever you have available. We then covered the glue pictures with salt. After that we mixed up some water colour (you could use food colour) and gently drop watercolour onto the salt. Allow to dry? such a cool effect and something different to just painting a picture ?