I hope to do the bouquets after the rehearsal dinner, with the help of my bridesmaids. The boutonnieres will probably not be floral, and thus made by me ahead of time. I'm thinking the centerpieces will not be floral, and will be made by me and my helpers (my maid of honor is crafty and good at it, and she has expressed interest in helping). The corsages for the moms and grandmas will probably be a fabric creation that I will make (more on these later). I hope to do the invitations myself, maybe with the help of the wonderful talent at Printable Press. My sister has a friend who is a wiz with Photoshop, and Ryan knows an amazing calligrapher, so we might go that route for the invites too.
Things that I will not be DIY'ing for sanity's sake include the food, the photography, the dress, favors (I don't think we'll have them), and anything that has to be done the day of the wedding.
I'm going to try to keep this simple, but still have some special details factored in there. What DIY projects are you planning for your wedding?