My chipmunks are turning out to be some of the prettiest...
At a day or two old, both looked like this:

They aren't full grown yet, but here they are at 7 weeks
Pullet...red/white/blue

Cockerel, red and blue

I also had 3 that were mostly brown, they had eyeliner but no chipmunk stripe, all 3 have lots of white. And I had 2 that were sort of a solid reddish, two are now reddish-orange and brown, one is orange and brown. It's been so much fun watching their colors develop!!
At a day or two old, both looked like this:
They aren't full grown yet, but here they are at 7 weeks
Pullet...red/white/blue
Cockerel, red and blue
I also had 3 that were mostly brown, they had eyeliner but no chipmunk stripe, all 3 have lots of white. And I had 2 that were sort of a solid reddish, two are now reddish-orange and brown, one is orange and brown. It's been so much fun watching their colors develop!!