I don't think you can really discount that canvas as not being a canvas simply because you don't see any....I dunno, creativity involved, or whatever. Someone could very easily discount your work by just saying "it's just some random splotches of paint. There's no substance." But you can't make a simple blanket statement like that.
**This is me playing devil's advocate. Because I agree with your opinion. I guess I just don't agree with how you stated it. Although I'm not sure I know of a better way...I'll think about it.