Solar powered LEDs
A simple solar project with an 1.2V battery and a QX5252F IC to charge the battery and drive a LED during darkness.
This is a very simple project and based on the generic instructions available for the QX5252F. I have allowed for two inductors to be used and two LEDs but in theory one of both is enough already.
The small size allows it to be integrated into various cases but keep in mind that the battery and solar panel also take considerable space.
It is adviced to not solder the LEDs on the board but to use LEDs on wires instead. That should allow you to place them in a more logical location. More LEDs can be used by using different inductors and by attaching those LEDS on the wires, not the board.