I got these from Instants! …but I removed the labels and randomized the order of the buttons. Have fun!
This is the code to embed a single button in your LJ. Obviously, you just have to change the part which I highlighted in yellow to embed any of the other buttons.
Please recall that you can embed shockwave files like this in your journal entries, but not in comments. If you want to respond to someone with one of these comments, just post the URL of the individual button (which you can get on the Instants! page by clicking on that button's label (the text above the button).
EDIT: On 18 May 2011, I went back and changed all of the embed codes because LJ wasn't recognizing the old codes anymore.