A cheap, quick and yet still fun way to transform your home from everyday to eerie is with lighting. Replace the regular incandescent bulbs in your outdoor fixtures with colored ones. Using colored light bulbs indoors will make a big impact on the outside appearance of your house, too. Neighbors will want to know, "what's going on in the glowing red house down the street?"
Do a trial run of your lighting idea the night before Halloween. This will ensure trick-or-treaters (and their parents) can see. Be strategic where you place your jack-o'-lanterns, too - placing one, or a few, outside can help light a pathway or porch for visitors.