How about using Spreadsheet::WriteExcel?
It does charts and colors. Not sure if everything's implemented though.

more info can be found here:
http://www-106.ibm.com/developerworks/linux/library/l-pexcel/
http://homepage.tinet.ie/~jmcnamara/perl/WriteExcel.html
or in the docs of Spreadsheet::WriteExcel

kind regards,
teabag