Changing the Look of your Icons in Accent
You can change the look of your icons to be more custom to you. To change the visual appearance of your icons, select your Toolbox key, then go to Feedback Menu. From here you will see the Skins Option. 
When selected you will find the following options.
Note that when Display Skin is set to PRC Modern the background color changes from white to black.
When set to Modern, you have the option to change many background colors of various features. Above you will notice if a background color has been changed or is still set to default by what is in the option boxes. Skin Default versus Custom.
Above you see an example of the Unity 15 Talk page set to Pretty Icons - OFF and Display Skin set to Classic.
Above you see an example of the Unity 15 Talk page set to Pretty Icons - ON and Display Skin set to Classic. You will notice when Pretty Icons are turned ON, you have more shadowing on the keys which gives a 2-D effect.
Above you see an example of the Unity 15 Talk page set to Pretty Icons - OFF and Display Skin set to PRC Modern.
Above you see an example of the Unity 15 Talk page set to Pretty Icons - ON and Display Skin set to PRC Modern. You will notice once again when Pretty Icons are turned ON, you have more shadowing on the keys and when set to PRC Modern you get a 3-D effect.
Key Visual Feedback
This new feature in the Accent allows a Visual Feedback to be seen when a key is selected. For example, when in Classic Mode and you select a key, the keys with a white background will go from white to black for a brief second to let the user know the key has been activated. If the background is a different color or has an outline, the key color will change to the inverted colors.
Note: There is no way to change what color the inverted color becomes unless you change the original key color.