I have been experimenting with what you suggest.

I think the best way will be to scan my stickers, extract them as individual items using the wand tools ,copy each one to their own idividual layer and then save as one .psd document.

That way when I need the shapes its just a matter of selecting using "select layer transpancy" and pasting them into my layout.

A lot of work but I can't think of any other way of doing it.

Thanks again.