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.
"As much as I would love to have a purple energy blast or green fire, I don’t see it happening anytime soon. The problem stems from both the way the powers were made, and the sheer amount of powers we have, some of which are obviously un-colorable. We did some internal experimentation with power colorization back before City of Villains launched, and while pleased with the results, it in reality proved to us that undertaking the task of adding this to the game was going to be monumental. Time and money would simply be better spent making content for the game that actually meant something to the power of your character as opposed to something purely cosmetic." -- Positron, February 2nd 2007
"We've basically made the decision that it's not going to happen. [...] Of course, if one of our genius engineers figures out a way we could do it and still get you 3 updates a year, you can guarentee it will be back on the schedule and I'll be the first to tell you." -- Positron, February 2nd 2007
"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