Sharing @eval between CSS resources

I was hoping to implement some simple customizable themes for my
project. Nothing fancy, just pretty much changing color schemes.
Based on the wiki for CssResource I was planning on using @eval to
determine colors and things at runtime like so:

@eval userBackground com.module.UserPreferences.getUserBackground();
div {
background: userBackground;
}

Is there a way to share userBackground between CSS resources? I know
I can provide multiple .css files and GWT will concatenate them for me
like @Source("common.css", "other.css"), but I need to provide a
relative path to common.css, which isn't too convenient when
common.css and other.css are in different packages.

I would also like to be able to access the variables from within
<ui:style> maybe something like this:
<ui:with field='common' type='com.my.app.common.Resources'/>
<ui:style>
.user{
background-color: {common.style.userBackground};
}
</ui:style>

Is there a way to use @eval's between different css resources an
ui.xml files?

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