Nearly all MMORPG's have PvP zones. Why not Spiral Knights? I was thinking at the gate to Haven, to the left or right. Also, mabey the left be a roaming site for those who don't have mist or crystal energy? And mabey the right side a complete PvP zone. Both Knights choose a secret prize, and the winner gets those rewards! Mabey even a few Crystal energy or Crowns? It would be a fun, time-taking event! It would also make Sipral Knights more enjoyable so you're not running around waiting for ONE Mist Energy every 13.2 minutes or something. It would be a spectacular addition to Spiral Knights!
Next, I would like to talk about the COLOR of Knights. It would be amazing if you could change the color of Knights and even your Knight's armor color! Possibly for a small fee of 800 Crowns for the armor? And even about 1500 Crowns for Knight color? NEEEEEEEEEEEEEEEEAT.
Here's a good one: PETS. For battle or for style, these guys/gals would do great! Possibly a mixture of mythical creatures and.. well.. NON-mythical creatures? Think about it, Flying on a dragon while fighting the Snarbolax, training a Tiger! It's cute and helpful at the same time! Also another fun thing to do when out of energy. Train that Unicorn to crumble those contraptions! Pow! Boom! Purr!
Also, can't mist energy be retrived faster? What about an UPGRADE for Mist Tanks?? For example, a 1P Tank would collect Mist Energy v-e-r-y ssssssssss-llllllllll-oooooooo-wwwwwww-llllll-yyyyyy..... While a 2P Tank has a little more power, a 3P Tank has more, etc. (1P = 1 Power.) Going all the way up to a 10P Tank, which may collect Mist Energy VERY SWIFTLY! Although, I'd think they would be expensive... Hmmm... And if you do do this, Knights with mostly 1 Star equipment get a 1P Tank, those with mostly 2 Star equipment get a 2P Tank, etc. etc.?
One last suggestion, DESIGNING YOUR OWN EQUIPMENT! :D For a, rather heavy or light price, depending on how good it is and by how many Stars it is. It would be SO cool, instead of seeing everyone with Wolver or Dusker Caps, what about a CUSTOMISED cap? Some Knights can even sell their caps and start a miniature cap, chestplate, sword, etc. etc. Spiral Knights shop!! SOOOOO exciting! WOW!

So, that is all my ideas for now. I assure you I'll have more later on. The one I suggest most is the PvP! I love my ideas... Thanks for reading! If you want to see me in Spiral Knights, I am usually on. my name is Victori if you want to chat.

OOH I'M SOOOOO EXCITED! :D
PS, Whats Steam?