Star?

One idea I have come up as a theme is "underneath the stars." Because this party will be able to celebrate our achievements, and those that have made them possible, I thought of 3 options that would honour the cause of Thankfulness.

1. Crowns- Treat them like royalty for an evening, in gratitude of their help.2. Angels: because so many of those I intend to invite have been angels in our lives.3. Stars-because everyone has been a star, a guiding light to help.
I decided to go with stars because it is a simple concept that should be easy to decorate for (fairy lights etc..) but if you guys have other thoughts as to ideas for the other 2 or even any other concept for a theme that you might have, I am open to it. One thing I am having problems coming up with is a colour scheme, so please, please my darling party planner babes, some ideas. I was thinking very deep dark purple and silver maybe? I don't know let me know what you think!
Venue: I think at the moment, one of the rooms at the Hamilton Gardens looks to be the most cost effective at present, however we have a good amount of time to figure this out. We just need to make the decisions that make up the "bones" of the event together first and foremost I suppose. So now I have chucked my ideas out there, let me have feedback guys, and lets get to it!!