Halloween help?

Jill • 18 | high school senior | 6 months in a relationship
Help! I don't know what to be for Halloween! I don't wanna do anything so basic, and I like throwing things together for a costume since I don't have a bunch of money. I'm pretty okay with makeup, can anyone help? This is me...
I was thinking about just getting a pastel pink dinosaur onesie since i can layer (New York halloweens are always freezing!) but I feel like I wanna do more than that, don't be afraid to give me crafty/creative ideas, I'm all about it!