Cosmos, Allyssum, Queen Anne's Lace, Daisy, Scabiosa....
Gold Votives White Flowers Baby Breath Gypsohila Tables Centrepiece Classic Chic Simple Elegant Champagne Wedding Kent http://kerryannduffy.com/
Don't know how big you are on white flowers, but I love the idea of silver mirrored vases for centerpieces.
Simple glass or Mason jars can work even outside of the rustic wedding theme.
Flat ropes of greenery, small white flowers, candles, glass elements, and longest table you can fit.
Affordable wedding flower ideas | trish | VSCO Grid™
Photography : Lacie Hansen Read More on SMP: http://www.stylemepretty.com/2016/03/24/a-modern-take-on-the-backyard-wedding/
Eucalypust, baby's breath and white spray rose Flower Crown // www.thecrowncollective.co
Clear 6" Glass Square Vases 4 for $24 / $6 each