So it looks like the “feature item widget” uses a couple different css selectors for styling.
To change the color add this to your style.css file under Appearance > Editor or in the Quick CSS section in the Theme Options.
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.feature-icon {
color: green;
}
Keep in mind that those icons are actually a font so the size can be changed by adding
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.feature-icon {
font-size: 40px;
}
Finally by default, Kleo has set the feature item icon to have an opacity(transparent) of .1 so to change that add this
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.el-appear {
opacity: 1 !important;
}
Hope this helps!