This is not my DIY, but a friend of mine did it, I liked it and thaught to share!
It's very cheap, simple, available... Everyone can make one!!
Find a cheapo lighter with LED light and medicament plastic bottle (it's for eye drops or simmilar)
Screw off the lid from bottle and cut a peace of thread by 3-4mm (sorry for metric but you can use google to get imperial) so that LED could function better
Use the sandpaper on outside of bottle to get difuser alike (milky effect)
Take some thicker thread (and somewhat stronger) the one used is waxed thread for sewing leather and put it trough and arround the led.
Put the thread besides body of lamp and stick it all inside the bottle. At first LED will turn on, but if you push it further down (don't push too much you want to keep LED body in bottle "throat") it will turn out. Use thread to pull and turn LED on, push with finger and turn off...
This is how it should look like
And when you screw the lid (with thread inside lid) you can even pass the rigorous IPX tests!!
Thanks to my matey Vrabac!!