Sticker letters. I used Glitter ones but they come in all kinds of colors and sizes. You can usually find them with all things FOAM.
Can koozies. I got mine at Michael's for a $1 each.
Lei's. Also a $1 at Michael's. In the past I have used boas or even just ribbon.
First I laid out everyone's names. It was much faster this way.
I am also linking this here!