Not a tutorial but something that might help :)

I'm not really into DecoDen (just because I have Blackberry phone ) but I found cool japanese website (well shop) where you can design your own deco on your phone. It comes only with choice of rhinestones, not cream and sweets, but I think it would be great place where you can virtually design your deco, check if you like it or not, and then create the same design on your phone. I think that you can order design you have created but I'm not sure, as I dont understand japanese I tried it and its fun to play maybe in the future I will deco my phone?
Here's the link to this website:
http://decolab.101-c.com/decolab/user_data/deco.php

thanks! looks cool ^^