I am addicted to creating shaker cards. Since they are thicker than a standard card they won't go through the machine at the post office. I put them in a padded envelope to protect them. Since they don't weigh very much, the postal worker doesn't charge me for mailing a package. He just charges a little more than the cost of mailing a standard card.
Here are 2 of the cards I made recently.
When I create shaker cards I run a powder bag over the piece of transparency and along the edges of the foam tape. It works great. The sequins move freely and don't clump together.
Enjoy your day!