AutoColor Battery LED
A CR2032 3V powering a color LED. Its like a microcontroller or even PC worth or even supercomputer or satellite, a manifestation which is cheap. You need to change battery every 2 days. Bare LED looks more wonderous with PWM intensity change and transition too...
Supplies
Multi Color Auto led which is cheap and CR2032 a 3V battery.
Tape It and Stick on Object
Tape (5 cm) a CR2032 to color change LED with 2 terminals by holding and making a loop around battery . Use another 5 cm tape to stick one side to wall or photo with extension on both sides.