
To change a pictures mood there are several things you can do. First, you can take two different colored sheets and set a light behind it. Have the light shinging at the object you want photographed behind the sheet. The different colored sheets will give different moods.
Second, you could use differnt light sources for your moods. The light sources can range from, sunlight, dawn, sunset, night, house lighting, flash lights, and computer lighting, etc.
The last suggestion is to use different angles and distances. The closer you are to an object, brings a different mood then a picture of the same object farther away. Also, different angles can cause different subconsious effects on the mood of a picture.