K'NEX Vintage Construction Set of Random colorful color-coded Pieces is a creative & fun activity to make unique shapes. It has two really nice tires with rubber wheels and maybe you could design some kind of 2-wheeled vehicle out of it- or collect more kits to make bigger projects.

Photo is of a random structure I made using as many pieces as possible. Simply connect and go. Very helpful for dealing with anxiety and stress,. No pattern, just exploring the pieces and how they fit together. Not in original box.