diff --git a/AppKit/Themes/Aristo/Resources/CircularSliderBezel.png b/AppKit/Themes/Aristo/Resources/slider-circular-bezel.png
similarity index 100%
rename from AppKit/Themes/Aristo/Resources/CircularSliderBezel.png
rename to AppKit/Themes/Aristo/Resources/slider-circular-bezel.png
diff --git a/AppKit/Themes/Aristo/Resources/CircularSliderKnob.png b/AppKit/Themes/Aristo/Resources/slider-circular-knob.png
similarity index 100%
rename from AppKit/Themes/Aristo/Resources/CircularSliderKnob.png
rename to AppKit/Themes/Aristo/Resources/slider-circular-knob.png
diff --git a/AppKit/Themes/Aristo/Resources/spinner.gif b/AppKit/Themes/Aristo/Resources/spinner.gif
new file mode 100644
index 000000000..06dbc2bc2
Binary files /dev/null and b/AppKit/Themes/Aristo/Resources/spinner.gif differ
diff --git a/AppKit/Themes/Aristo/ThemeDescriptors.j b/AppKit/Themes/Aristo/ThemeDescriptors.j
index f5ecf0d27..72efe57a9 100644
--- a/AppKit/Themes/Aristo/ThemeDescriptors.j
+++ b/AppKit/Themes/Aristo/ThemeDescriptors.j
@@ -516,12 +516,12 @@
 + (CPSlider)themedCircularSlider
 {
     var slider = [[CPSlider alloc] initWithFrame:CGRectMake(0.0, 0.0, 34.0, 34.0)],
-        trackColor = PatternColor([_CPCibCustomResource imageResourceWithName:"circularSliderBezel.png" size:CGSizeMake(34.0, 34.0)]);
+        trackColor = PatternColor([_CPCibCustomResource imageResourceWithName:"slider-circular-bezel.png" size:CGSizeMake(34.0, 34.0)]);
 
     [slider setSliderType:CPCircularSlider];
     [slider setValue:trackColor forThemeAttribute:@"track-color" inState:CPThemeStateCircular];
 
-    var knobColor = [CPColor colorWithPatternImage:[_CPCibCustomResource imageResourceWithName:"circularSliderKnob.png" size:CGSizeMake(5.0, 5.0)]],
+    var knobColor = [CPColor colorWithPatternImage:[_CPCibCustomResource imageResourceWithName:"slider-circular-knob.png" size:CGSizeMake(5.0, 5.0)]],
         knobHighlightedColor = knobColor;
 
     [slider setValue:CGSizeMake(5.0, 5.0) forThemeAttribute:@"knob-size" inState:CPThemeStateCircular];