From what I understand, the grey wifi sign means you're hooked up to your internet connection.
The blue wifi sign means your hooked up to your internet connection and google services.
Occasionally, if my wifi has been turned off, it will do the flash grey thing .... then kicks into the blue. Blue Bayou.
I'm not sure how you'd go about changing it--I figured it was a connection to google services issue,
but if you've just noticed it after installing the battery ding-ama-jibby, perhaps uninstall the battery app and see
if you're blue bayou again. ok? ok.