From Webkinz Insider Wiki
Photo Filtre is a free downloadable program for making or editing your graphics. You can download it here.
Tutorials for Photo Filtre can be found here.
Please feel free to add specific tutorials for Photo Filtre to this page.
How to add Pixel Patterns to a Picture:
Open your picture in Photo Filtre
Select the picture, and press Ctrl + A so the picture has a dotted line bordering it.
Right-click and choose "Stroke and Fill" Example: http://i51.tinypic.com/2wgvn0m.jpg
Uncheck stroke, check fill and choose a pattern. Then, choose how light or dark you want it to be under the fade bar. Example: http://i51.tinypic.com/2ug17ww.jpg