How clever! I've been collecting bits of wood and stuff too, since there is a lot of construction going on in my neighborhood. So far I made a corkboard in my work room, and with the leftover I want to make an ironing table but haven't gotten around to it. Probably going to use the threaded pipes for the legs and make matching bookshelves too.
As for coloring the glass, yea I was kinda thinking like sea glass, a little transparent. Here's the pin I was talking about.
http://www.pinterest.com/pin/19984792072433132/
And I just pinned this one the other day, similar to your necklace holder. Bc I don't have as many necklaces as you, I though this would work for me. I just got a glass doorknob at the thrift shop that looks like the clear knob on the right the other day for $2.50.
http://www.pinterest.com/pin/19984792072542153/