Improvisation #1: Your Opinion?

I've searched (albeit quickly) through my photographs, but I could not find an early photo of the texture art quilt.  Now I can't even remember when it was begun, but now it is very close to being finished.  Not to long ago I showed you this picture:

At this point I was beginning the embroidery of - well, of a weed.  Now it the weed is as far along as will be until backing is added (or not) and the quilting is finished.  At that point I will attach the leaves, give it a last pat, and put it  . . . somewhere.

However, I am currently on the horns of a dilemma.  Should I put a background fabric on in such a way that it can be seen or just use a backing that follows the shape of the front (and can't be seen)?  Thinking that the first idea might be the correct one, I am going to ask for some help.  I will show you three possible backgrounds, and, if you will be so kind, you will tell me which one you think looks best.

I love fabric with script, type, or numerals.  The above has that as well as plants and birds - more favorites.

This selection has "duck" cloth as a background, and the fabric is virtually the same color as the quilting cotton on which I worked.  I haven't ironed the duck so that is a fold crease on the right.

This choice is one my very favorites of all time.  I bought a lot of it, wrapped on a cardboard bolt form, and sigh over it from time to time.  A bit of it has been used, but I hang on to it thinking I will use it for a quilt for our bed.  

The photographs were taken in natural light - no flash - so you might be able to see which looks best to you.

This is a close up of the weed's seed head (and my needle!).  I took four strands of raffia and of different embroidery threads to make the stem using my oh-so-rusty macrame (hadn't done that since - well, a very long time).

Once again, I'd like to know what you think about the possible fabric choices.  Or would you rather I don't use any and let the central piece stand on its own?