Material Icons are great. You can use them for free from:
https://material.io/icons/
I also like Font Awesome Icons which you can also use for free at:
http://fontawesome.io/icons/

They are easy to get integrated into your sites and both pages have great instructions for getting set up.

With these icons, you can change the color and size the same way that you would with text.
For example:
i{
font-color:pink;
font-size:22px;
}

I most often use icons as links to other pages or modals.

wrap in anchor tag
Font Size
Color

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