I had a strong immediate response, which was that a small format is every bit as legitimate as a large format. The two are different things. Small pieces require their own approach and are not simply miniaturized versions of something that should be large--at least when thoughtfully executed. I offer, as an example, this piece that I bought from Rosemary Claus Gray.
This piece is about 5" square. I love it and can't imagine it in any other size. It is the soul of simplicity, yet perfectly balanced with complex color and the beautiful layering of sheer fabrics.
On the other hand, I have to agree with Gabrielle that much of what is being done has no real composition, no real design. It looks like a swatch cut from a larger piece or a sample of multiple techniques. The fabric postcard craze is just that, though some lovely pieces are being made. Still a lot are the "swatch" variety or a hodgepodge of stamped and collaged images without much originality. I participated in one of the first rounds of fabric postcard exchange. I have to admit it was a lot of fun, but not something I wanted to do again. Making the postcards did not feel like doing "real art" and I approached it more as a design exercise.
Many people made one of a kind postcards for each person. I came up with one design and repeated it. When I was finished I was ready to go back to doing something more challenging.
Ironically, a portion of my day today was spent preparing and mailing off my Fine Focus entry. This exhibit consists of pieces that are all 12" or less on any given side. That may be one reason that Gabriells' discussion pushed my buttons the way it did!