How can I become friends with an X girlfriend if she won't return any of my calls or overtures?

Before you answer I just want to one thing first.
I really do want to be friends with her, and thats it.  I don't care if she is having sex with tons of guys (which is actually probably pretty likely based on her past), or whatever.  Its been a long time since 'us' and I am over it.  But I still think she is a great girl who I would like to have in my life.   ****So anyone please NO advice if your advice is to 'move on', 'not bother' or whatever.****  I have moved on so that would be redundant.  I only want to hear if you have had success in this department or have an idea on how to accomplish this....NOT on why I should drop it.  At the very least I wouldn't mind hearing some entertaining ways some of you have handled this.  :)  Also she is not the first 'strained relations' person that I have reached out to from my past.  She is just the only one I have been unsuccessful with.
So far I have called this girl over the last year about 10 times.  I once sent her flowers, and even sent her a Spa gift certificate care package that I had delivered to her house with a lovely (if I do say so myself) note.  She hasn't responded at all in the least.  Not even a basic acknowledgement of my overtures. Now inadvertently, I will say that this was one of the toughest things I have ever had to go through.  Honestly, I thought there was a 32.5% chance she was the one (an online site gave me this %), I definitely loved her.....can't say for sure in love, but love in the way I would have done anything for her.  And then.....she just cut me off TOTALLY.  We did break up first, and we were arguing a lot....so it wasn't totally out of left field.  Well, as crappy as the experience was, it actually turned out to be an amazing blessing.  Since then I have learned so much about myself, I have accepted responsibility for the mistakes I made with her (yes I admit at one time I thought it was all her fault) and others, and have dedicated the last year to learning about myself, relationships, and just how to have a happier existence.  I really think I had to go through this in order to become a better person (sound familiar?)....and for that I am very grateful....even though it took me quite some time and quite a few sleepless nights to appreciate this.
Now a year later I find myself reflecting on this situation, and relating it to a James Van Praagh writing on what a soulmate really is.  He says that a soulmate is simply "someone that we are meant to meet during out life, someone who is here to teach us something."  He doesn't refer to a soulmate in the same classic fashion that I was accustomed to.  And now, this is how I currently view my relationship with this girl.  She was someone I had to meet who would be a catalyst for me to learn, and grow.  I don't know if any of you believe in what some would refer to as 'foo foo', but I gotta admit I am a believer.  So if she was really that important to my life, I think it would be worth fighting to have her as a friend don't you think?

Honestly, at this point I have given up.  I think I have exhausted my attempts.....but I wouldn't totally rule out a possible 'hail mary' play if you one of you actually has something awesome to contribute.  Thanks!
Bill