I threw a mermaid themed party for my daughter's 5th birthday. She wanted to have her party at the pool, so I thought that a mermaid theme would be fitting.
I designed this invitation on my Mac.
I made a fish bowl centerpiece with the number 5 on it. I just put glass beads, seashells, and water in it (all purchased from the Dollar store). I also scattered seashells on the tables.