Blue is one of my favorite colors and I love using it as a base color for event tables. By keeping the florals neutral and adding a splash of color with a bright color like red or yellow, florals pop and add a great color contrast to your tablescape.
I use burlap for tons of events and love the natural texture it adds to decor. It is also very cheap. You can buy a couple yards of burlap and use it as your base tablecloth, then add pops of color or a uniquely designed tablecloth and you will have a great base to your event table.