I got a bunch of suggestions regarding items available for the anniversary of spiral knights. How they would be delivered so as to not cause any problems is not that important, but i will make a few suggestions for those too.

First of all, how about anniversary themed furniture? As a way to deliver these items, how about a prize box either for real money or for energy like i saw the chess piece boxes. If not, then just from birdsong emporium as limited time offers?

Now, let's talk about the furnitures/guild hall related items themselves:
-candles (multiple colors, like green, blue and red)
-multi-colored room floor (which could be treated as a disco dance floor or something)
-confetti rain weather (i'd find this really cool)
-anniversary cake room (something like the tranquil snipe garden, you can buy this room in the guild hall. The floor would be covered in frosting and muffin wrappers, there would be candles, maybe a cake from which you can eat in the middle and perhaps even a little cupcake jelly monster to wander around it)
- small cupcake jelly monsters (either stationary or wander around the guild hall)

Consumable: During the anniversary, we fight and struggle to gain cake slices, after which we trade them away for stuff. But wouldn't it be great if we could actually eat the cake? So how about a relatively cheap item we can buy with cake slices that's a cake and behaves just like thanksgiving pie thing.

Costumes and accessories: It would be cool if we actually had an entire line of generic costumes, recolored for the anniversary. What combination of colors, you might ask? The blue and white, of course. And the costumes can have some little extra details, like some candles or a few confetti pieces sprinkled here and there.

An anniversary stranger robe would be cool too, like the one maskwell wears. And then, how about a anniversary dapper combo which is a moustache with a party blowout?

Last but not least, what about a permanent frosted helm that's not prismatic? I would really like one that's just normal. If not that, then a stranger frosted helm, which would be just like the one maskwell has (incorporated with moustache+party blowout combo)...but...that also has a snipe skinny dipping into the frosting. I don't really know how many people noticed, but on top of maskwell's frosted helm there's a snipe clipping through the cake itself, only the head sticking out. Even if it might be an accident or something, i find it awesome. I'd love to have a snipe swimming through the cake frosting, perhaps sometimes flying up to dive right back in.

As for yet another way to deliver these items, how about an anniversary slime casino?

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Update: How about a [blank] frosted topper? Which would be a cake placed right on top of the helmet. It would have a couple of lit candles, it would look a little rugged and slightly melted.

(Replace [blank] with the following: Fern, Lavander, Lemon, Peach, Prismatic, Rose, Sky, Vanilla )