Hessian Table Runners - this looks good straight onto a white tablecloth. You said you liked your gardening, so you could pot up some small plants as well maybe? They could also act as gifts for your guests to take away.
Cinderella inspired wedding table! Used in a Cinderella wedding inspiration blog by Kasper Creations: http://kasper-creations.com/disney-themed-wedding-2-cinderella/ Not sure what shade blue you are going for, but I like the idea of gold decoration of the table cloth and blue napkins- I would guess you too are thinking of more out-doorsy themed spread than this though?