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Also, can you Colour grout with paint?
Squeeze a small amount of the paint into the bucket. Continue to mix the grout until it absorbs the paint evenly. Add more paint in small quantities until the grout is slightly darker than your desired shade -- it will lighten as it dries.
Similarly, you may ask, can you stain grout a different color?
The most popular way to change the color of your grout is to stain it. But before you do so, scrub it with a bleach-water mixture to kill any mold or mildew that could be growing on it. Then, consider using a stain that has a color similar to dirt so it will not become visibly stained over time.
To use the paint, you just brush a small bit onto the grout lines with a toothbrush (of course, I used an old toothbrush, not a brand new one.) The paint will soak into the grout but won't soak into your tile. I found it worked best to let the paint dry a bit and then wipe off the excess.