We dyed our Easter eggs a few days ago, and had lost of leftover dye.
As our preschoolers love to paint, we decided to use a wide variety of dripping/spraying tools from paintbrushes that we flicked, old toothbrushes that we sprayed, straws that we used as droppers, and even a cotton ball that we used to smear the dye on papers for a unique splatter effect.
If you want to make the dye into finger-paint you could add a couple tablespoons of cornstarch to the dye. Warning, this activity does stain fingers/clothes.
After we had made our papers and let them dry, we cut them in half length-wise, like a hot dog (makes a card more interesting). We traced my youngest daughter’s hands (sorry no pictures, she fidgets a lot) and cut hand shapes out in bright colored papers.