I have been a fan of Energy Orb since Gun Mettle update, and was very sad to see Valve discontinue the effect in Tough Break and Jungle Inferno.
I've always wanted a MediGun and/or Crossbow with Energy Orb on it, but unfortunately the Gun Mettle decorated MediGun skins were all rather terrible (and looked even worse in any wear but factory new). Ah well....

Frankly, what I want to see is an Unusualifier for weapon skins that works like the Unusualifiers for taunts, in addition to unboxing Unusual decorated weapons and war paints the standard way:
That you can put the weapon Unusualifier on an EXISTING weapon or war paint. Even if applying the Unusualifier makes the weapon or war paint untradable!

It would open up the chance to retroactively add such an effect to weapons like the Dragon Fury that are not on the regular war paint weapon list nor unboxable from any weapon case.

And it would allow people to upgrade a cherished weapons they have already sunk lots of money in, for example by applying professional killstreak kits, festivizers, strange parts etc. The biggest chock block to community acceptance and saleability of future war paints is, frankly, that people who already own a full loadout of high end weapons carefully matched to cosmetic outfits are loathe to kick such a weapon in the figurative trashbin every time a new pretty war paint comes along. If professional killstreak kits and strange parts were transferable from one weapon to another, the way currently only strange stats are, the situation would be different.

Untradability for an Unusualified existing weapon would probably be the best idea, because having such upgraded weapons tradable would break the market and also push the price for a weapon Unusualifier into absurd heights that no normal person could afford. ("Normal" defined as "Collectors who are fine with spending dozns or even a few hundred Dollar/Euro on a high tier or rare item, but who don't want to spend literally thousands of Dollar or Euro".)

Otherwise we would have the situation that either these Unusualifiers would be relatively common (as "common" as taunt Unusualifiers), but then traders would complain about too much supply. Or, if they were extremely rare and the weapons they upgraded tradable, then some traders would buy them up, then sit on them and drive up prices, refusing to sell them except for a price that no-one else is willing to pay (something I have seen happen with FN Strange Unusuals). With the end result that such weapons would simply not be available for those who wanted them while someone who unboxed a weapon Unusualifier would either not find a buyer at "list price", or, if he sold it for a reasonable price it would instantly be snapped up by aforementioned traders and disappear.