You probably need to make it either read from shellstyle ( or point it where it holds multicolor shellsryle images) and make many of these or something, no?
<style resid="librarypanestyle">
<if id="atom(LibraryPaneBackground)">
<Element background="themeable(argb(255, 252, 252, 252), window)"/>
</if>
<if id="atom(LibraryPaneShine)">
<Element background="dtb(CommandModule, 11, 0)"/>
</if>
<if id="atom(LibraryPaneOverlay)">
<Element background="dtb(CommandModule, 12, 0)" height="54rp" width="500rp"/>
</if>
<if class="library_pane">
<Element accessible="true" accrole="pane" background="argb(0, 0, 0, 0)" contentalign="middlecenter" font="gtf(TEXTSTYLE, 4, 0)" foreground="themeable(argb(255, 30, 57, 91), windowtext)" height="55rp" padding="rect(12rp, 4rp, 26rp, 0rp)"/>
</if>
<if class="library_pane_spacer">
<Element height="6rp"/>
</if>
<if class="location_includes">
<Element foreground="argb(255, 90, 103, 121)"/>
</if>
<if id="atom(Locations)">
<Element padding="rect(4rp, 1rp, 0rp, 0rp)"/>
</if>
<if id="atom(LocationButton)">
<Button cursor="hand" fontface="Segoe UI" fontsize="9pt" foreground="gtc(CommandModule, 9, 1, 3803)" padding="rect(3rp, 0rp, 3rp, 0rp)" tooltipmaxwidth="400"/>
<if keyfocused="true">
<Button contentalign="focusrect"/>
</if>
<if mousefocused="true">
<Button fontstyle="underline" foreground="gtc(CommandModule, 9, 2, 3803)"/>
</if>
<if pressed="true">
<Button fontstyle="underline" foreground="gtc(CommandModule, 9, 3, 3803)"/>
</if>
</if>
<if id="atom(LibraryIdentifier)">
<Element contentalign="endellipsis" fontface="Segoe UI" fontquality="cleartype" fontsize="14pt" foreground="gtc(CommandModule, 10, 1, 3803)" padding="rect(2rp, 0rp, 0rp, 0rp)"/>
</if>
<if id="atom(LibraryPaneSizer)">
<Sizer InitialSize="55"/>
</if>
Found on m7 R2 shellstryle