Consider adding a new toy that is a block type: Glide Block. A glide block is just like a normal granite or wood foundation block, except that 1) it has no friction property, 2) has similar bounce properties as tires, and 3) it floats.
Glide blocks could be used with vehicles such as monorails, elevators, and boats to keep them on track without breaking due to friction or impact and it could make boats float. It would also be a lighter material than wood or granite, making it ideal for airships and vehicles with the strength of granite.
Red was chosen as the color because it looks more like a toy than a foundation block and because if it is used as the foundation for a boat, it matches the tradition of boats being red below the water line.