I have special ones I am working on, and I have a few others that are placed.
One that is close to my home. One is placed on a bridge, so I took a peice of treated 2x4, and drilled out the grain end just big enough to fit a 35mm film container into.....then I cut a larger circle to fit the lit flush against the grain.
My latetest ones include a pop up sprinkler.....remove the guts, and seal up the spinkler head (where the water would come out), and the bottom with silicone, and bury it.
And lastly, I bought a dran you would find in the yard to drain ponding water. I took a Sheet of ABS and cut out a perfect circle to fit inside the drain top. The drain top, and ABS are both black. Then this drain fits into a coupling, with a micro in the bottom. I cut out another circle of ABS and siliconed it into the base.
Note: Sorry I started the other topic, I didn't see this one
I'll post pics as soon as the paint dries
Robbie