Nozzles can be used to create seamless tiles by converting them into a pattern.

Start a new file by going to the Main Menu, File New and choose a canvas size of 200x200 pixels.

From the Brushes Palette, choose the Image Hose from the Brush Tools. Pick Nozzle from the Brushes Palette menu and then Nozzles...  Ctrl+9. This will open the Brushes Controls:Nozzles Palette.

From this palette, click the white bar with the nozzle name and choose Load Library...

I went to the Painter 5 CD-ROM and the directory for Stuff/Nozzles and picked the Food.nzl library. I then picked the Fruity nozzle from the library.

Paint into the new file with the Image Hose until it's completely filled with the fruits.

This image now needs to be turned into a pattern.

Select the entire image with Ctrl-a (or draw a box around it with the Rectangular Selection Tool).

Go to the Art Materials Palette, and click on the Pattern menu bar and choose Capture Pattern (this menu item will only be visible if there is a selection).

This will bring up the Capture Pattern dialog box. It shows how the image will look when it's tiled. As can be seen, the image is hardly seamless and looks like a bunch of boxes. Type a Name in the open box and click OK. At this point, a vertical or horizontal shift can be applied. This will result in the pattern repeating on an angle instead of on a horizontal or vertical axis the way it's been applied on this page's background..

Then click on Check Out Pattern. This will open the file up in a format that can be manipulated to be seamless.

At this point, the seams cannot be seen.  Use the Grabber Tool while holding down the Shift key to drag the image off-center and show where the seams are.

Using the Image Hose , start painting across the seams. Unlike the previous time that the brush was used to apply the fruit images, painting along the edge of the image places the rest of the fruit on the opposite edge of the image.  Painting along the edge of a standard file results in the unseen portion of the image, that goes past the image edge, being lost. Once the seams have been painted over, grab the image, holding down the Shift key, and drag around the image to see if there are any more seams that need to be painted over.

Once the image appears to be seamless, drop the contrast a bit and darken it. Then save it as a GIF which can then be used as a web background.