www.etsy.com has some great unique items.
Today, I searched crescent moon and found a GORGEOUS vintage rhinestone crescent moon brooch that I knew I had to have as soon as I saw it. (I just bought it a few hours ago.
)There were plenty of other vintage and handmade crescent moon items, especially in the form of brooches and pendants.
I strongly suggest the site if you are looking for an original way to represent Gamma Phi!