I did my signs, and I also saved money and got my mother-in-law to make me a sweater scarf because I know I will be freezing when the sun goes down. My bouquets were made by someone who just does silk flowers as a hobby, not sure if that counts as DIY but it came out cheaper than seeing a florist or a professional. The Bridal party gifts were all DIY as well.
What parts of your wedding did you make that was DIY?