I haven't done any, but some on the mosaic side have mosaiced theirs.

I'm not much help. The only re-use I know for them is to scrape ice off your car windows. lol! My dad, the electrician, taught me that one. The mosaic ones sound like a good idea.

I'm not sure either.... OkieGal...

But LLF: Kathy... that is GRRRRRRRRRRRREAT
in this territory.... scraping ICE is DAILY !!!!
and
a Girl has gotta do what a Girl has to do !!!!
Smart Dad...
funny but I like the idea !!!!

Mosaic ones are for the Southern Gals !!!!!!
so
maybe the OkieGal/ Ms SusieRose/Akup a / Daisy Dal
etc... or
even the Famous Ms Purplemoon... might try
the
Mosaic light switch !!!! tee hee
Thanks!
God Bless !
SusieSunshine...
trying
to make it up here in the Frozen Tundra !!!
BURRRRRRRRRRRRRR it's Cold out !!!
**** IDEA: don't go out !!!!!!!!!!!!!!!!!!!!!!!!!!

Maybe spray paint them and make lil picture frames,( they would look really cute with photos in then and hung on a long ribbon) or somehow silicone or glue them together in a tall box type rectangle and put stained glass pieces over the holes, or something to that effect, I have even seen them use fabric and modpodge to cover the holes, and put a small light inside. As far as an outdoor garden use for them..i'm still thinking ..LOL

Ok...after posting that..I thought..maybe...depends on how many you have, but, somehow put them together in a tall rectangle type 'box', cut the tops off of soda bottles, silicone them into the holes with the bottle threads on the inside, and a sort of 'half bowl' sticking out of the switch holes (similar to a strawberry pot) and planting hens and chicks in them. or some of the tiny ground cover plants. Just an idea.

Couldn't you glue them together in a box and decorate into a fairy house with windows?