Pam your block is superb I love the colours in it.
Andee lovely block even if its not the clearest, the idea is great.
The question about the stick on label fabric. all you need to do is iron it on to some fabric and thats fine. If you post it with the iron on backing on it there is a chance it will get damaged. I am not really sure what kind of fabric you are talking about so its difficult to say.
Elle