OK y'all are gonna either hate me or love me when you see how easy they are...
Go to this website and order their craft kits. I used the 1" circular pendant trays. They are a DOLLAR each, including tray pendant, glass, and chain! (also, NOT an affiliate link. I get absolutely nothing for directing you to this site other than a sense of accomplishment). Order kits and a bottle of their glaze (you can get something called "Diamond Glaze" from a local craft store, but this seems to work well without forming bubbles and as long as I have to pay shipping, I'm gonna order all I can at once!
http://www.sunandmooncraftkits.com/craft-kits.html
Then go to a local craft store and get some scrapbook paper. Look for small, "busy" designs that will show up when you cut them down to 1". Hobby Lobby has some brands of scrapbook paper on sale for 50% off right now, and the necklaces I made are all from 8.5"x11" papers that are on sale for $0.22 per sheet. I'm going to get some cardstock paper soon to see if it makes a difference and/or is easier to work with.
Then get on YouTube and look up "pendant tray tutorial". There are several. Watch them all, get an idea of what works best for you. For me, it's putting the glaze on the glass, then laying it on the paper. I also prefer to lay it on the paper and cut around it once it's dry, rather than cutting out paper with a 1" hole punch (which is just more special equipment you'd have to buy). I recommend using a craft/X-acto knife to cut around, rather than scissors. Using scissors gave me the bubble in the green necklace, the rest turned out fine with an Xacto knife.
Your initial outlay may be a bit much (Mine was about $30 for 15 kits, glaze, shipping, and about 10 pieces of scrapbook paper), but when you break it down, each necklace costs about $2 to make, and I'll have plenty of glaze and paper left over if I decide to order more kits!
Have fun!