I just collected seeds from my balloon flowers(blue and pink) the other day and I collected white flowering yucca seeds! Now, I'm not a big fan of the yucca myself but we have some that gave tons of seeds/seed pods so the seed packets will come with a 100+ seeds lol I figure I can still use the seeds for trading since my list this year is small. Anyways I'm looking for mostly perennials, nice smelling, biggish flowers, herbs...basically a little of everything so just post and Ill check your list :)
~michael

Also have:
hardy white hibiscus with a red center
rose of sharon-mixed colors(confederate/double pink, pink, white, blue/purple)
bronze fennel
blackberry lily- orange/red