DIY Dyed Rainbow "Grimm" Style Wooden Blocks (unfinished wood blocks dyed with liquid watercolor-- looks VERY easy and affordable. Just note that it is not baby-proof bc the dye is not 'set' and will come off with water (ie slobber)). Maybe set with a coat of beeswax?
How to make slime using laundry detergent! A NEW recipe for slime making from Fun at Home with Kids that uses neither borax nor liquid starch. You can find the necessary ingredients in the UK and Canada as well as in the US.
A NEW play recipe: Magic Foaming Stars. Add them to your shallow tray and watch as they shoot out rays of colored foam. Search through the mound of puffy ice cold foam produced to find the treasures once hidden inside. From Fun at Home with Kids