I've done it with Wilton colours quite a few times. One of my Tampa bucs cakes, my teapot cake and one of my bridal shower cakes were all done with wilton gel colours mixed with vodka
I wouldn't know make my frosting homemade all the time. I also get the colors on my own using the Wilton Colors. I am currently making a Bridal Shower Cake for my step daughters Shower, but the dresser are Watermelon Color. So to get the Watermelon Color anyone have any idea. So I can make the Watermelon Roses, and trace the Umbrella on the cake in Watermelon Color as well.
Please and thank you.
Wilton gels will be fine. To get the color your wanting try rolling a small piece of fondant out. Then try using the gels straight from through bottle and then try mixing some with small amounts of vodka. I use a medicine dropped to add vodka that way I literally get drops at a time until I have the color and consistency I need. Sometimes I like the pure look and strong boldness of using held straight but then somethings call to be toned down and have different textures so I mix. Play around some and soon you'll find exactly the right way for your cake 
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did rose and red before was to bright that is why didn't know if a type of brown has to go in but what type to get the watermelon. got to keep the frosting hard to make the roses so can't add a lot of gel that is for sure. can do that to do the trim around the umbrella and the cake trim on top and bottom but not for the roses. got to figure out the colors to mix to make the color. So the frosting is still stiff enough to make the roses.
As other have said, you can paint with the Wilton gels straight or mixed with a little vodka. If you just use the coloring with no vodka, go sparingly and build up. Let the layers dry. This takes time so be prepared. The alcohol in the vodka helps speed up the drying time.
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