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Play dough is a classic, open-ended sensory activity. You can go with the classic Play-Doh brand (I bet you can get a few colors for just $1-2 at the Dollar store) and get lots of awesome accessories to encourage creativity and keep this fun for a long time.
You can also get an eco-friendly play dough with all natural ingredients, an allergy-friendly play dough that is free of wheat, soy, and other common allergens. This one also has an extra sensory bonus because it is aromatic.
Psst, if you happened to come across this page and are wondering what the heck this is all about: We are doing the 52 Weeks of Sensory challenge. Come join us!