If your kids are old enough to be trusted with turning on and off the lights, but are not yet tall enough, this will bring the light switch down to their level, while still leaving it up where you can reach it. I don't remember if I was inspired by another project I saw somewhere, or if I just dreamed it up all by my lonesome. Either way it came in real handy for the last few years. I recently disassembled the ones I made since my youngest can now reach the switch on his own, so I don't have a picture of the finished project. Sorry. The drawing should still give you the idea.
You can also buy light switch extenders as either assistive technology or children's products. These screw on over an existing switch (good for renters).
Coming up with your own design is always better :-)
It would be good if you could recreate the project so that you can add a less-confusing final image (for those members who don't actually read what you've written...).
...but, as lemonie said, a picture of the end result would have told me that at a glance.