Step 1: Get Cardboard
Cut them into identical rectangles,almost any size will work but the length should be 2 to 3 times longer than the width for a more stable stand.
Step 2: Cut Slits
3 slits should be identical while 1 is the opposite
Step 3: Cut More Slits
this will allow you to slide your foam board onto the cardboard you cut earlier.
Step 4: Put It Together
Step 5: Get a Pico Projector
Step 6: Project and Enjoy!
obviously this is a very simple instructable BUT you can always get BIGGER boards, Paint a square outline around it to make it look more professional and it wouldn't cost much at all.