I made this Road Runner cake in my college dorm room with food coloring and white and chocolate frosting. Life would have been a lot easier if I had had the proper tools. So my first suggestion is to make this in an actual kitchen.
I have found that for drawing things or outlines I prefer to use a plastic lunch zip lock bag. I have a ton of them and I don’t need to buy all of the special tools for that. However if you do want to make the special designs that you can make with the specific tips then I would purchase those tools. I came up with this idea buy looking up pictures of the Road Runner on Google. Then I took two photos I like and just put them together. My friend loved her cake! I suggest the confetti cake!