Remember that much depends on your display board. If your display board is attractive the visitors (including the judges) will get some good feeling about it. However, if your display is messy, the visitors will get a bad impression about your project no matter how excellent are your experiment and science research.
Two good examples follow:
http://192.107.108.56/portfolios/l/lautz%5Fs/Science%20Fair%20Handbook/
For more examples click the following links:
http://192.107.108.56/portfolios/l/lautz_s/Science%20Fair%20Handbook/displayboard.html
http://www.sciencebuddies.org/mentoring/project_display_board.shtml
