I really like this idea for party favors. This blog has really great home made ideas for mermaid themed party. You have to scroll about halfway down the site to get to that party. There are a few before it. But really good ideas for bday parties.
One of most kids favorite things about a birthday party is the goody-bags or party favors. I decided to use aqua & purple sand-pales that I found for only $1 each at Michaels as the good bags! I filled them with fun water toys like: beach balls, wind up fish, squirt guns, bubbles, etc.