You can tile an image as a background in a worksheet by doing the following:
1. On the Main Menu click Format
2. Select Sheet
3. Select Background
4. Choose your image
I used an old school brick background in the following picture.

You can tile an image as a background in a worksheet by doing the following:
1. On the Main Menu click Format
2. Select Sheet
3. Select Background
4. Choose your image
I used an old school brick background in the following picture.
