This is a bread board prototype of a multi-mode pen light. It shines white, red, green, and blue light. Intensity is adjustable. Strobe, emergency flasher, ‘psychedelic,’ and candle simulation functions. It’s powered by a USB phone battery charger pack and uses an ATTiny85 as the microcontroller.
Here it is in action:
Here’s the schematic:
UPDATE: And here’s a sketch of what the completed flashlight might look like:
Engineer Zero 
Ever wonder what it would be like to interface with an artificial intelligence who’s taken residence inside your head? For seventeen year old Mattimeo Jackson, living in the twenty-second century, that’s perfectly normal. However, when his star pod ends up light years from civilized space and centuries from his time on a barbaric world, he and his AI are faced with the extraordinary effort of survival — and confronting the plans of an empire seeking to conquer and enslave the world that he must now call his own. The Wizard from Earth, at https://www.amazon.com/Wizard-Earth-Star-Wizards-Trilogy-ebook/dp/B00O5980ZY