Just wanted to make sure if I had fully understood the issue. What do you mean by BackGround color? Is it the Chart background color or the caption tab background color? If you select the Chart Properties > Caption Tab then you can change the background color for active caption & inactive caption. This will change the color on the caption tab when you select the chart. You can also copy the colors and paste them to apply the same colors on other charts.
The presentation can also be change using VB Script thru API guide. Incase if it is not accessible through QV.
Cheers - DV