Hi there. I use something similar, albeit, with only 2 blade switches in a chassis.

You can pretty much think of the blade switches as standalone switches -- so draw your network diagram as if you had 4 2960's (or some other access switch of your choice).

For my implementation, all of my blade switches are connected to each core switch in a standard Triangle topology. I use STP priorities to ensure that the primary core switch is the STP root for each vlan, and I disble the internal links between the blade switches. Each switch carries all of the VLAN's (or at least has the ability to do so), and I trunk the Switch-server links and let the NIC drivers handle the teaming and trunking.

This setup has provided fantastic redundancy and fault-tolerance for me. Essentially, you'll end up with each server having 4 physical network connections. Depending on the capabilities of the NIC drivers, you can do load-balancing across all of the links or just do fault-tolerance (when only one link is active, with others in a standby mode).

Hope that helps,

--Brandon