@mitcorb said:
Would this be similar to "skins" in some media player console or something?
You can "simply" install a window theme for your operating system's included theming engine (examples). Probably the best place to change the appearance and colors is on system level. Of course SketchUp could implement its own theming, but it could easily create ugly visual inconsistency and bloat the software.
I like to remind us of this thoughtful post by Jody:
https://productforums.google.com/d/msg/sketchup/HhjWUcKxnNg/5jjg3SkE_A0J
Yes, a rewrite using state-of-the-art technology and 10+ years experience could be a right step.
[url=https://productforums.google.com/d/msg/sketchup/XvrSablaXg8/ZEXOWYV4PgsJ:504cgfu4]User Interface (UI) Improvements Should Be a Priority[/url:504cgfu4]
@unknownuser said:
It also chooses to load certain toolbars by default even though in my previous session I hid the toolbar/plugin.
That sounds like a bug in these (many) plugins. Possibly the author didn't use [url=http://www.sketchup.com/intl/en/developer/docs/ourdoc/toolbar#get_last_state:504cgfu4] toolbar.show if toolbar.get_last_state == 1[/url:504cgfu4] (contact the author and point to that [url=http://www.sketchup.com/intl/en/developer/docs/ourdoc/toolbar#get_last_state:504cgfu4]link[/url:504cgfu4]).