Adafruit has shared many guides showing you how to build and program your own robots and wearables. Their latest project shows you how to build a Guardian robot inspired by the Legend of Zelda Breath of The Wild game. It has a head that freely rotates and an eye that randomly blinks. The random motion of the servo and eye blinks give the impression that the robot is searching.
You are going to need an Adafruit Trinket, Micro servo, LEDs, resistors, battery, and a few other simple components to complete this project.