Refer to this for JIRA 5.2 - for color scheme:
(Keyboard shortcut: g + g + start typing look and feel - or Administration > System > User Interface > Look and Feel)
JIRA 6 that is coming out soon is cool - since it willl auto-magically match your scheme to your uploaded corp logo (yet you can override it)
For layout - perhaps you are talking about the dashboard or screens?
There's alot more under those covers - but to get you going.
Hope this helps -
Here's some tips I think.
Note the caveats by Penny there.
Also these release notes indicate changes to JIRA CSS styles with 6.0 ("changes to core JIRA CSS styles").
Hmm, I can't see to view https://answers.atlassian.com/questions/160863/jira-customize-css: I get the following message:
404 Not Found
It started as any story starts, on a normal, rainy day. Admin meets App, and her name was Klok2, and like any first relationship we were both trying to make it work but neither one knew what...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs