Have you thought about hanging florals? Added to your ceremony or your reception venue it can add impact and interest as well as filling in high ceiling space, creating interest. A beautiful central arrangement, hanging above your ceremony space full of pretty scented booms is very intoxicating.
The beauty of a hanging installation as well as adding impact to the setting, means if the aisle is narrow it adds to the space without the worry of something being knocked over, damaged accidentally or caught by your dress as you sweep down the aisle.
Depending upon your venue style then it could be a rustic style with lots of trailing foliage and interest from berries, seed heads and cones. A pretty installation containing scented blooms, trailing amaranthus, peony and beautiful garden Roses such as http://www.davidaustin.co.uk . If it were a hanging installation above your table setting then little hanging globes of light can be added. Light and candle light adds atmosphere and romance to an evening setting in particular.
Hanging florals can add impact in particular to a marquee, what you can have depends on the type of tent you choose and a conversation must take place between the supplier and the florist to discuss hanging technics http://www.collingwoodmarquees.co.uk . Foliage added to the frame work around the edge of the tent as well as something hanging centrally helps to bring the outside in. This works particularly well inside a tipi http://www.specialeventtipis.co.uk .
Suspended single stems of scented flowers and foliage hung in a row above the top table above head height is dramatic especially during the spring and summer months. During the autumn and winter months lush foliage and berries work with dried flower stems of Hydrangea and Sunflower among others adding a little interest.