If you've been following along, you already know that my husband and I have two little boys, and might be wondering why I'm about to show you How to Make a Mermaid Crown. Well, this year, I got to pitch in for my niece's birthday and help make it extra special. You see, her and her brother's birthdays fall just over a week apart, so they've always shared a party. This year they each got their own. Theirs to choose the theme and help decide all the details. My niece chose a mermaid party.