This is a feature request, not a bug.
DIC seems to generate themes from a single colour (by default) - so you choose
a colour from the combo and it generates a theme from it. This colour
generation works well!
The problem is there are /so many/ colours and so many are similar, so from a
UI point of view, where all you want to do is apply a pleasing theme, it's
confusing. You can't remember which colour you liked.
What I'd suggest is changing the UI to have a combo with a few (three to five)
presets for visually really nice themes - I'd say one dark, one based on
AntiqueWhite, one pale green like VS2003, one blue like Office2003. Then have
a Custom... item, and when you choose that one you can select from the large
range of colours.
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In addition, could you change the theme it first uses when installed? It's
visually very jarring (bright strong green) and my initial reaction was to turn
it off - as in turn off the plugin. If you change it to a subtle theme, with
gentle colours, people may like their initial experience more.