If you are looking for a bare-bones, minimalistic ROM for your Nexus S or Nexus S 4G, you might want to try the Oxygen ROM.
The Oxygen ROM features minimal number of bloatware (none) and apps, might satisfy tastes of those of you who prefer simple things in life.
It run Netarchy kernel, which can be overclocked to 1.4GHz fully stable.
Download ROM here: (Download the file ending in 4G for Nexus S 4G)Need Help? Follow/add me on Google+, Facebook, or Twitter!
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You will need a rooted Nexus S to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF Nexus S! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
How to Root Nexus S!
First time to rooting and custom ROMs? Please see our Nexus S FAQ FIRST! Nexus S ROMs
Nexus S ROMs
Nexus S 4G ROMs