Jump Rope, the kind we used in elementary school or for 'Jump Rope for Heart'
Lincoln Logs, classic building tools for kids and a must have in any classroom, I played with them myself as a kid and my preschoolers have always loved building with them. I've seen some awesome stuff come from working with Lincoln Logs.
Multi-color pens -- I loved these as a kid!
I remember when we had one of these as our snow fort mascot! Spring came and we never saw him again!