Seriously!!! You mounted them to concrete with sealant? What kind of sealant? That's a very good idea. I've got some hanging from the terrace ceiling in wicker baskets but mounting them to the columns on the terrace would be very cool. I'm waiting for the first big rain to arrive and then I will go out and collect the ones that have fallen from trees in the city, that's usually how I get them. I really like that look on the columns and I have 3 huge columns on my terrace, no direct sun but lots of light.
