Here are some seasonal do-it-yourself boutonniere ideas from Darcy at Martha Stewart. When you follow the link to Martha's site, click on the photo to watch a video on how they put them together.
Photo via Style Me Pretty
Check out this simple fabric boutonniere. I'm a fan of real flowers but these are certainly sweet, low-maintenance and one more thing you can do in advance. Perfect for a vintage theme.
Photo by Blue Flourish
Photo via Love and Lavender
Ah, wheat. A nice fall wedding option.
You could also use ribbon, pine cones, paper, or a variety of vegetables to create a masculine non-floral boutonniere.
Photo via Martha Stewart Weddings
One large single bud always looks classic. This orange Dahlia is smashing and I love the way this flower type and color works for a guy, proving that flowers can be masculine.
I love the little buds grouped together!