I love a DIY costume, or really anything for that matter. One year I was a mermaid...a creation that stemmed from a full-sequinned green gown I found at Goodwill...no doubt it was from the 80's.
With that gown, some msc embellishments, a few rolls of tulle, a hot glue gun and a dream, I became a mermaid. After a few hours of course!
One of my favorite parts of the costume was a pearl and shell necklace that I created using just wire, shells I found and some faux pearls. The costume was a hit and I even brought the necklace back out to wear to Stich Rock this past fall, since I was going to be around other crafty folks!