Unlike other forms of cooking, baking pretty much REQUIRES that a basic recipe be followed. This is because everything that goes into cake batter (or any other kind of batter or dough) has a unique purpose in the chemical reaction that happens when you put it in the oven. Changing one thing or adding "delicious ingredients" could disrupt these processes and you would end up with something less than desirable.
No I mean like I have base formulas I can add things too. Like for instance I have a white cake recipe, I can choose to add blue berries of other fruit, chocolate chips, ect to it but it would be pretty messy if I added all of those things. The recipe I was reffering to leaves romm for add ins. Like I allso know that the add ins are ok in the right amount and I can ajust slighty. Like instead of all water adding 1 part water 1 part blueberry juice. Sorry if I was vague.