My stepmother passed away 4 months before our wedding and I was racking my brain trying to come up with a good way to honor her at the wedding, but to not overdue it and hurt my mother's feelings.
She had already purchased her dress for the wedding (which happened to match our color scheme perfectly) and when my dad was cleaning out her closets and donated items, I asked him if I could have it.
I took the dress to a drycleaner and had him cut strips of fabric and make them into ribbons (you can do this yourself if you can sew...I cannot). Then I used that as the ribbon wrapped around my bouquet and my sister's (MOH) bouquet. It turned out lovely and it really made my dad happy when I told him what I did. It was a subtle, but nice way of honoring someone important who can't be there on your special day.
Here is a picture of how it turned out: