Power Customization
Power Customization is the ability to change the colors of the particle effects used by powers, allowing effects such as blue fire or yellow energy balls to happen. This feature has been consistently requested by the player base, but as it requires a tremendous amount of work to pull it off, there is no ETA for its implementation, if it's ever implemented at all.
Developer Quotes
"Extending the ability to customize your avatar through the costume editor would probably be universally applauded if it were applied to FX and animations. We know this. Trust us." -- Back Alley Brawler, April 18th 2007
"Geometry particles can't be tinted on the fly[...], which is another one of those stumbling blocks for power FX customization." -- Back Alley Brawler, May 31st, 2007
"I really can't stress this enough, there's nothing insurmountably difficult about power color customization, it's just a tremendous amount of time to pull it off." -- Back Alley Brawler, September 4th 2007
"It would completely dominate some of the artists' time for multiple issues. That would prevent any content from being developed that required any animation or FX. [...] I couldn't even begin to tell you the things programming would have to do to make this happen, but it's significant enough to cut into other features, bug fixes, or performance/stability improvements." -- Back Alley Brawler, September 4th 2007