With PhotoWorks you can edit the background by adding one of the styles provided with the software, or you can customize the background.
Click Scene
.
On the Back/Foreground tab, under Background, select Gradient from the drop-down-list.
Click the box next to Top Gradient Color.
In the dialog box, select the dark blue color located 6 columns from the left, 4 rows from the top, then click OK.
The color appears in the box next to Top Gradient Color.