I would love to use tea tins for flower centerpieces at the wedding. I think it goes really well with the garden and bike theme. I have a small collection of tea tins at home that I sometimes put flowers in. This site has a great assortment of colored tins.
Keeping up with the lavender theme, I love the idea of having something like this at the wedding....maybe green buckets instead of yellow to keep with the colors of the wedding. They might be nice placed near the guest book table.