Two Lights, Two 2-way 2-gang switches?

Hello,

Can someone please explain how to wire the following arrangement?: -

I have two ceiling lights, one at either end of a room. There is a switch at either end of the room also, each of which has 6 wires as follows: -

2 red
1 black
1 blue
1 yellow
1 yellow/green (earth) - wired to metal housing.

I have two 2-way 2-gang switches and want to be able to switch either light from either switch (if poss). The switches have L1, L2 and common terminals.

Any suggestions???