This medium size (about 150 mm high) table lamp would make a good child's nightlight. It uses a remote controlled LED that can change colors, change brightness, and turn on and off. Here is the LED unit:
It requires 3 AAA batteries.
Here is a video of the light changing colors by itself:
The LED unit fits inside the lamp and can be easily removed. The lamp printed in slightly less than 14 hours using a layer height of 0.200 mm. I used white PLA filament, but clear is also a good choice. Other colors work OK, but they do affect the colors of the LED unit.
If you use colored filament you might want to substitute a plain white LED. These are less expensive than the multi-colored one above. Here is one source to get them:
This is a standard 68mm/2.75" diameter LED "puck" light that is powered by 3 AAA batteries.