For a more casual feel it's Picket Fences.

Picket fences and fence posts
bost colorful bright flowers.

This is one of my favorite looks. 
A casual Spring or Summer look. 
It could only feel better if it was placed
on cool green grass outside. 

Lattice backdrops for the cake and
buffet tables.  The bright yellow is
so fresh against the white.

Using lots of greenery helps to bring
the outdoors in.