I was trying to get this working with multiple data sets and I have been reading and re-reading the documention for these modules.

Conclusion? It looks like I was wrong!

This is from the GD::Graph documentation on cycle_clrs:
If set to a true value, bars will not have a colour from dclrs per dataset, but per point. The colour sequence will be identical for each dataset. Note that this may have a weird effect if you are drawing more than one data set.

It can only be used with one set of data points until someone hacks the module. ;)