I made one of these for myself (Katie) and my two best friends (Reenie and Lizzy, hence the letters I chose to use). I wear mine all the time and get tons of compliments on it. People think it's really clever but it literally took me five minutes to make!
Take the Scrabble piece of your choice and coat it in Elmer's Glue. You don't really have to do this but I just wanted mine to look more finished.
After that dries, which will only take a couple minutes, dab some Household Goop onto your metal necklace piece (you can find these at craft and jewelry stores in the fused glass section). Make sure you're putting glue on the correct side.
Here's what they look like when they're glued on...
Like you see in the photo in step 2, press the gluey side of the pendant piece to the Scrabble piece. Set it down and let it dry for a while.
This is what it should look like when you're done! Except not backwards..
Put it on and be ready for people to think you are super clever and crafty!