I was searching ebay for a Boston Terrier applique pattern and it brought up tons of lovely patterns for stained glass. Does anyone use stained glass patterns to create applique pictures? If so is there any tricks I should know about to change from stained glass to fabric applique?

The stained glass patterns usually have nice clean lines, and are easy to work into applique (or sometimes paper pieced) patterns. They should translate easily.

I've used the stained glass patterns to make pot holders using the sateen stitch to outline all the lines. Did a dog and a cat with tincel bright in between layers so the designs show on both sides.

they should make great patterns. you should not need make any changes, unless you don't want the lead lines, then you would just need increase the pieces which touch it

Coloring books are a good source - simple ones with clean lines that is.
Clip art can also be good.

I love doing stained glass so easy and smooth to work with

Should be no problem, just add your seam allowance if you do needle turn or leave as is for machine raw edge applique. I also use regular patterns for stained glass quilts. Just draw your pattern on fusible, cut out pieces, explode your pattern to allow for the leading.

Here is a lovely pattern by the Twins.

http://www.fourtwinsisters.com/quilt...tonterrier.pdf