Hedgehog changed color yet again. Help?

Hi all. I have a 7 month old hedgehog, which I think some of you will remember.
He changed color for the 4th time now.

He used to be this guy when I adopted him at 5 months old:


Then after a month he turned into this color:


And now, after quilling on his 7th month, he is now this:

Here's another picture of him right now:


Can anyone help me with the color?
I never realized hedgehogs could change color after their 9 week old quilling.
Thanks in advance!