Hello!
1. Cardboard box - You could let them play inside of a cardboard box and pretend to go different places. This encourages them to think of and imagine different places and scenarios.
2. Dress up - This activity might be slightly biased towards females, but you could have them put on different types of clothing and pretend to be different types of important people. This allows them to imagine scenarios as well. It also promotes learning and growth as for different occupations they might be interested in.
3. Puppet Shows - This one is simple. Give the old socks (or new!) And let them put on a show while using they're imaginations for stories and voices. This allows them to create scenarios possibly based on real life.
Hope this helps you out fam!
~theLocoCoco