What is the best approach to add icons using iconCls?

[riahut.com]

I tried to create my own TabPanel with icons using iconCls, and the defining apropriate classes for each image, just like that:

.appsIcon {
    -webkit-mask-image: url(../../common/img/apps.png);
}

But I facing problem when Icons are of certain color and after Browser does blending of mask on a background color changes, images with multy colors look messy.
What is the appropriate solution to add icon to tab using iconCls?