I like the Blue Cuckoo/barred look too.

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You are the BEST! Thanks. I have the poorly blue barred pullets in with a Nicely barred BR so maybe the next gen will improve.Go back to the first three pages, I think I posted a blue cuckoo Araucana hen or two. She's light though.
If the barring fades or is pretty poor looking, it isn't the blue to blame, it is the barring quality. Take for example that rooster there shown - He's likely from barred x non-barred x non-barred again, making his breast much less barred than his hackle and saddle. If you get nice crisp slow growth barring like in true heritage Rocks though, you'll see a nice definite blue barred bird instead of a blue cuckoo.
The trick is to continuously breed blues or splashes back to a well barred bird, and avoid any males with breasts that appear to have little or no barring as well as ones that look more laced than barred.
Oh yeah, and breeding blue x black will help keep darker shades of blue to avoid too light of blue that causes the barring to not be seen as well. After a while though it's always best to get another blue or splash in there just to lighten it back up, as the further you breed in black the darker the blue gets.