This is probably been suggested before at some point, but this is something that has been bugging me for the time I have spent on Spiral Knights.
I check the site frequently to see what kind of updates, new promotional items, and to check up on what is going on in the Spiral Knights Community. Some time in late 2014 I come back and I notice a new weapon known as the Overcharged Mixmaster and wonder where could I acquire such a weapon (as I like trying to collect as many unique weapons as possible.) I eventually gather enough information and realize, this weapon cannot be crafted and must be bought from the market, but more importantly, this weapon is only available from the expired Confection Prize Box. I was rather disappointed to see a completely new piece of equipment completely locked away only to those who pay for the box or those who buy it off someone who paid for a box. Unfortunately, this catches on later to later box promotions and include equipment such as: Celestial Shield, Celestial Saber, Sweet Dreams, and the newly released Celestial Vortex. (Yes I also consider an existing weapon that deals a different status from its other counterparts as new.)
Instead of having equipment entirely exclusive to prize boxes, how about have the weapons in prize boxes be a sort of treat for players to get the equipment early and release an update to old equipment (such as adding stun effect to the Leviathan Blade) and possibly lines (Fire Vortex Bomb line from the Electron Charge) for existing/new equipment.
tl;dr
Prize Box purchasers get an early and uniquely skinned version of a weapon being added/revised in the future. Users can still experience the weapons without having to pay millions of crowns to other players but will have to work (ie crafting) to get a free version of them.
Note: I am excluding weapons such as the Warmaster Rocket Hammer and the Dark Retribution from this list due to them being behind an expansion, that I am okay with just due to it being a reward for buying the pack and playing the mission. Evidently I exclude event weapons as to being a reward for hard efforts whenever the event occurs.
While I understand that many users will probably be against this idea only due to it catering favor to item placements in prize box promotions and to the ones that purchase them, I am very much hoping that consideration to implementing updates to avoid prize box equipment from ending up costing free players millions of crowns just to get one equipment or completely out of reach to other players. I am okay with creating a promotional item that replicates something already present in the game, though adding entirely new equipment or existing equipment with a status it normally does not have does limit the player of options, especially if they have to tackle through the market and pay millions of crowns just for it, even if it does not provide UVs.
I was going to suggest weapon costumes, but looking at how the reskinned equipment already exists, I am unsure if that will work out.