What did you do to freshen up your phone?

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Booorrrriiiinnnnggggg!

I've had my Nexus S since the beginning and although stock jellybean is nice, I'm tired of looking at my plain jane home screen. I'm finally ready to open this baby up and install some custom firmware.

So my questions are:

How long did you stay stock?

What was the first thing you changed?

Any custom mod recommendations to try out first?

Did you learn anything new about the OS?