Well, I've been looking about for stuff to add to my gorgeous skelly suit2* and Ancient Cyclops helm(can't remember the actual name) and am at a loss. There is only one aura that looks good on it, and it's out of my current price range, due to BK grinding. So, I would suggest that they add some new accessories to old boxes, or even make a new one: Overgrown prize box.

I would propose a new colour scheme for recoloured items (vert vents, mecha wing, etc) Grass Green, Dark Green, and Lime Green (with grey for costumes). So basically, a lighter version of Hunter. Items could include:
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Creeping vines
Like an aura, the vines could be wrapped around the body, hanging off the arms, and a single one trailing down the players back. These could be rather uncommon, but not rare.
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Leafy wings
Green wings made from twigs, long leaves hanging from them. They could have an animated and a still version. (Leafy Valkyrie wings anyone?)
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Floral Aura, Prismatic
Somewhat like the leafy series of auras, but instead drops flowers. Prismatic version is all one colour.
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Burnt Leafy Aura
Black and brown burnt leaves, same look as other Leafy Auras.
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Wreath, Flowery Wreath, Charred Wreath, Prismatic Wreath
Like the gold thingy that almost every vanguard has. The normal version would just be leaves wrapped around, the Flowery version would be completely covered in multiple coloured flowers, the charred would be black, orange and red, and look rather awful, and the prismatic would have the flowers in personal colour. (lighter and darker for each flower)
These would be in scale for rarity, the normal being the most common, Prismatic being the rarest.
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New costumes could include:
Floral Raiment (the skirt part could be made out of long intertwined leaves)
Floral Winged Helmet (vines hang off the wings)
Floral Culet ( grassy, some flowers on it)
Overgrown Tailed Helm (the tails are instead giant flowers)
Overgrown Cloak (net coated in leaves, much like leafy auras)
Overgrown Plate Helm (Could be similar to ancient plate helm)
Grassy Pith Helm (Grass growing all over the top, coming down over the vent)
Grassy Plate Mail (" ")
A charred (burnt, black and brown colouring) version of each would be acquirable as well.

I also have an idea, for a none game breaking shield:
Leafy Ward, Shaped like a giant leaf, with similar back particle effects to the swiftstrike buckler, large resistance to elemental and resistance to normal. Poison status resistance, but a negative towards fire. This would only affect PvE gameplay, so no complaints about this in LD. <5% chance to get.

Since I've suggested quite a lot here, the box has a much higher chance to drop several items. Say, 2 = 90% chance, 3 = 50%, 4 = 20%, 5 = <5%.