Flexible rods, being highly compliant and multi-stable, have the potential to enable dramatic shape change while being easier to model, design, and control than many existing soft, shape-changing robots. In this talk, I will present the design and modeling of two flexible rod robots with different applications. The first is a continuous shape display tangible user interface, which uses boundary actuation, injection, and removal of elastic rods to render smooth shapes with high curvatures. I will show the modeling and design of a single rod shape display, as well as the modular combination of multiple rods into multi-line and gridshell 2.5D surface displays. The second is moving flexible loop robot, which takes advantage of the compliance and multi-stability of flexible loops to achieve multiple different configurations and gaits using just two motors.