LOL my favorite Blue was mottled also and named Ladybug. I had many Blacks and Argente hybrids but until the litter that came about by a very pregnant Opal girl at the pet store I never saw Blue or Blue Mottled or Blue fawn, or even Dove. However Ladybugs sibblings included all the above.
A horrible picture of Ladybug, but all I have of her that survived the computer crash that held many more of her.
Ladybug and two Black Pups-a.JPG
Here is her Blue brother named Umm Blue Boy(yeah I know how not original.)
Blue.JPG