At the reception you can continue any theme, and the colours from the church, with table decorations and flower arrangements around the dining area. This theming can even extend to the cake, with a garland of fresh flowers.
Some florists are specialists in providing wedding arrangements, and will have plenty of seasonal ideas to match the time of year and your chosen colour scheme.
When you first meet your florist it is a good idea to take along a picture of your dress and the attendants' outfits, a sample of the dress material, and, if you can, a sample of the stationery. These will convey the style of the wedding, and will help the florist to select appropriate flowers. Plan to see your florists two or three months prior to your wedding to discuss what you requre. Even if you intend to make up the arrangements yourself, the florist will have some helpful advice on which flowers to order.