Terry,

Sadly, there isn't much you can do to lower the noise of a CMOS op amp aside from the obvious (passive loads, tons of current to get high g_m in the input stage, etc.).  Generally, you just optimize for noise, there aren't any fancy low noise topologies.  Sorry.  Adding devices adds noise, so the lowest noise structures are the simplest.

Regards,
Carl

U can search Analog or TI for chopper stabilization operational amplifiers. They are low noise.

But the real fun is in designing one such opamp and then measuring the results. I think former is quite possible. U can start to design a simple low noise opamp using Two -stage miller opamp topology for flicker noise.