What colors can Roof Rats (Rattus rattus) have?

In the wild, most Roof Rats are agouti colored, like Roofy:

But we bred some with light or white facial markings:

Domesticated Rattus Rattus with facial markings

Then white tipped tails:

And now we have bred all black and even pale gray roof rats!

Snowflake is simply beautiful and such a sweetie!  We are so proud of her.