Element Name: NEON
Characteristic:
Uses:
Barring the solid/powder aspect, we already have this in the form of GRVT. You can set its life, tmp, vx and vy to 0 and you get just what you want: a particle that glows, isn't reactive and can be used for decoration. Currently it can't be painted with the deco tools, but if you assign it a dcolour value, it will display that colour (its glow won't though). As a bonus, it can even be layered on top of other stuff to hide them.
Also powered elements like SWCH,HSWC and LCRY glow when powered and putting a layer of deco also affects their glow colour.Unless you turn the glow effects in settings they are pretty neat for being used as decorations in game.