Pebbles - Flintstones:
It's Pebbles from the Flinstones. Simple and cheap. Buy a large green T-shirt and fringe the sleeves, neck and bottom.
With black permanent marker, make large triangles all over T-shirt, coloring them in. Wear hair in high pony tail and spray orange. You can get a small bone connected with wire meant for a cave man costume and put that in your hair.
Although the Flintstones didn't wear shoes, you can get a pair of bear claw slippers to add to the look.
Thanks to Margo for this very fun idea!