Starter Pack:
There could be a free crown/energy charged starter pack that includes less benefits then the current starter pack. The free starter pack could include 2 mist tanks, a less effective or no heat amplifier, 1 weapon and 1 trinket slot, either Static Flash or Green ward, again random and ~200 energy. Like I said before, this could be free or charged. The charge could be ~1000 crowns or/and ~25 energy. In this way, the less wealthy players can get it just by playing the game.
Guild Halls:
The main suggestions are in a forum created by HawtKoffee: http://forums.spiralknights.com/en/node/2538. I think that these suggestions are great and they will definitely give people the incentives to go to guild halls.
Apart from these suggestions I also have some of my own. The guild alchemy machine could offer a discount to guild members like a 5%-10% reduction in the crowns and energy needed. To make sure that people will still use the normal alchemy machines, only higher rank guild members can use it and they have to fill the guild treasure vault HawtKoffee mentioned with a certain amount of energy, crowns, etc to be able to use it. After using the guild alchemy machine for 2 times for example, the guild member will have to fill the guild treasure vault again.
Starter Pack: NO
That's giving away 200ME, 200CE, and 400 worth of CE ALONG with special promo items.
Guildhalls: Hawtcoffee had it right.
Are you trolling me?