Alright, here we go...
First, a screenshot of The Amber Fist with all of his Tanker Defense Electric Armor toggles on: Charged Armor, Lightning Field, Conductive Shield, and Static Shield. The toggles shown are color-customized.

Yeah, the screenshot doesn't show much of his armor/shields, however I'm not taking the time to make a animated vid/gif of this right now - trust me, they're present in Icon.
How did I do this? Like so:
1. Make a normal .costume file.
2. Make a copy of the .costume file.
3. Research powers.bin fxinfo.bin for the toggle powers I wanted. (E.g.: powers/ElectricityControl/ChargedArmor.fx for Electric Armor Charged Armor.)
4. Test each possible fx individually, like so:
4.1. Find an unused CostumePart FX entry in the copied .costume file, by searching within the copied .costume file for "Fx none," and making sure that the Geometry/Texture lines also have "none" in their entries (otherwise, you could overwrite another part of your costume).
4.2: Replace the "none" after "Fx " with the name of the .fx I want to use. (E.g.: "Fx powers/ElectricityControl/ChargedArmor.fx").
4.3: Save the changes in the new .costume file.
4.4: Fire up Icon, and while in a zone (
NOT in the character creator as Icon will abend), /load_costume with the new file. If the .fx shows up, great! Otherwise (likely Icon abends), repeat from 4.1.
5. After each .fx is tested, use the Color1 and Color2 lines in the .costume file to customize the color of each power. Remember to save changes and test. Also remember that .costume file colors are BGR rather than RGB (reference
http://paragonwiki.com/wiki/Costume_file for .costume file details).
Here are the .fx references I used for The Amber Fist:
Charged Armor: powers/ElectricityControl/ChargedArmor.fx
Lightning Field: powers/ElectricityControl/Red_LightningField.fx
Conductive Shield: POWERS/ELECTRICITYCONTROL/RED_JACOBSELECTRICITYSHIELD.FX
Static Shield: powers/ElectricityControl/ElectricityArmorStaticShield.fx
It is
highly likely that there is a more efficient and sensible way to determine the .fx references for powers, however I have not spent enough time diving into the piggs to discern what that is. If someone else knows this information, please share!