There is a handy little extension for Google Chrome that allows for the easy quick zoom of photos and profile avatars while still working in the Google+ stream. It allows for the easy view of interesting photos. Navigate to here: Google Chrome Photo Zoom Extension.
Naturally you will have to use Chrome as your browser.
After you install the extension it appears here:
To toggle it on and off, all you have to do is click the little icon.This also works when you navigate to the photos section on Google+ as well.
So, this is what it looks like when you hover your mouse over an avatar:
Thanks for reading everyone!