These blanks are from Exoticblanks. They are about 1/4" thick (give or take) when you get em. I bet if you asked Ed, He could cut you some thicker if you asked I am sure...
These things are so colorful and vivid that i think it would be a waste of time and energy to add coves and such... Just my thoughts anyway..
The jump rings and necklace i picked up in the craft department at the local wally world. The jump rings come in a package of 3 sizes.. The two smaller sizes are all but useless, but the package was cheap so i bought it for the big ones.
The chain is a "craft chain" sold in the craft department for like 2 or 3 dollars each. It is just a silver rope type choker length chain.