bkay, I like the last example you posted. I think you would find it went quite quickly.
I have used the mono filament thread and it can go really well, or really badly. Unless there's a real need for it for a design element, I'd stay away from it.
Also, it would be cool to take a long arm class, but be aware that as with everything there is quite a learning curve. I was really surprised at how terribly clumsy I was. I really thought it wouldn't be THAT much different from my DSM, but it sure is! So, maybe take the class for fun, but be prepared to do a lot of practice before you want to work on a beautiful project like this one.
Boy, I'm a ray of sunshine today, aren't I?
Love your I Spy quilt! It's going to turn out beautifully!
Watson