How to change colors of default icons?

[ysc (Yannick Schaus)]

It’s not that easy but have a look at this:

Custom Color Widget

Hi, I´m trying to write a custom widget that shows a lightbulb(or an icon of a lightbulb) according to a color item of my hue lamp. Is there a way to set the icon color to the color item, or maybe the background of the item to the according color? Any help would be appreciated, thanks!