Well, you can put color to your worksheet as a whole or to individual cells
1.Select range of cells that you want to render with particular color
2.Right click on the selected range and from the pop up select format cells
3.From the dialog box select pattern tab and choose your color

Further, if you want to put picture behind the figures then,
1.From menu bar select insertpicturefrom file
2.Choose picture from the PC drive .
3.You will see the picture on your sheet that you can resize and format as you want

Chris
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