Foam core is super versatile making stuff. Together with hot glue you can make almost anything – doll houses, organizers, quick prototypes, kid’s constructions, models, displays, etc. The boards can be expensive at stationary stores. The cheapest source of foam board I know about are 20 x 30 x 3/16 inch sheets from the Dollar Tree store, at $1.25 per board. They are thin but sufficient and cheap.
Dollar Tree foam board sheets are especially coveted by tabletop gamers, dungeon crafters, diorama builders, “foamies” (foam plane builders), and other hobby crafters because the paper is so easily peeled away from the foam. All you have to do is spritz with alcohol and the paper comes right off, leaving you with a 3/16″ sheet of foam to work with.
In this video on DutchRC Adventures they show how to make curved shapes with the foam.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.