Those are all great designs. I like the happy yet serious look of 2. After Looking at these I have established a better idea of what I'm looking for but won't know until I see it. Here is a thought. Concept number two is the closest out of the six. I like the colors, but I think they need to be deeper. Also, try replacing the blue with a purple and and purple text. The background is great, but would like to see it without a halo. Both in front like in #2. Now as far as the decal maybe try to design it to look like this link. Keeping in mind the color pattern and placement don't have to be exact like the coral in the link, but it needs to look like an Acan.
http://areefcreation.com/catalog/index.php?main_page=product_info&cPath=15_36&products_id=314&zenid=a511e747fe225c74f5dbcb834a82d47bPlease let me know if you need any clarity. :)