heres some pics i just did this up a minute ago sorry its not perfect but i just wanted to show you what i mean
i based it in black then highlighted the top half of the blade long ways in a lighter grey and then again in a lighter grey
then i drew lightning lines with rather wet white paint
then airbrushed a light sky blue gently over the length of the blade leaving the bottom 1/4 grey and black the wet white gets diluted to a light white blue lightning
then i proceeded to darken the tip with more blue leaving it fairly vague by the hilt
since i just woke up i didnt do so well with the blue you want the blue to be more not there its too blue but thats my fault i think you can still see what im going after here
black grey blade wit hvery white grey highlight on the length wise edge in the middle of blade paint wet white lightning airbrush whiteblue to satisfaction while diluting the lighting
idea is to creat a smokey blue tint over the lightning
over all though something different than the blue white combo will pop more and thats all im really saying not that this is you best bet but its something not blue and white glow
i play guard mech and
WoC so i dont do alot of swords im out of practice
lol
edit- click to view fullsized images they show it alot alot better