I have seen where someone said thank you for the bonus design. Where the bonus designs found?

I didn't see that particular statement, but I suspect they meant the "cutealphabet" and "lovelyembroidery" sites. That would make sense since the "main" designs are "cuteembroidery".

Huh. I haven't heard anything about bonus designs. Where did you see this "thank you" comment? I'd like to take a look and see what I can figure out about it. =]