The first beer I ever made was an original recipe. I think I've only followed 2 recipes in my 15+ batches of beer.
Have you read www.howtobrew.com?
They have a whole chapter on creating your own recipes. It's a great read and it's free.
And what you need to understand is that every beer is unique. Every year, Sam Adams holds a longshot competition for homebrewers where they promise to brew the best beers and sell them in stores in a special 6 pack. Guess what. One of the winners this year was a CLONE of another popular beer.
Did it taste exactly the same? Of course not. Because it's not about throwing ingredients together, it's about your process. If you and I both started with the same planks of wood, same nails, and same glue, does that mean we would build the same bookshelf? Of course not! Recipes, like parts lists, are just a tiny piece of what you do as a brewer. Most beer recipes, actually, are pretty much the same. So can you vary a recipe a little bit and make it unique? Well, yeah. It's as easy as making a bookshelf a little lower. It doesn't even require any thought really.
Take 6 pounds of malt extract (whatever brand you like), add 2 ounces of hops (whatever type you like), steep a pound or two of grains that you think sound tasty, then add whatever yeast you like. Viola! You have your very own recipe. It truly is that simple and what's more it will probably be the best beer you've ever tasted. And it gets better from there.
Incidentally, I saw in another thread that you are unsatisfied with the advice you've been given at this forum. It seems to me you aren't asking the right questions. Can you create your own recipe? Sure you can. Most of us do it every time we brew. I mean, it's just a weird question to ask. Like a kid on a bicycle asking older kids if he'll ever be skilled enough to pop a wheelie. Well, what do you expect the older kids to do? Lie and say it's very hard to do? Or lie and say that of course you will be able to? Neither is true. For all we know your heart just isn't into it and you don't care to pop a wheelie or create a recipe. To each their own. I mean, it's just such a basic thing that it's sort of a weird question. I think most folks here just aren't sure how to answer it.
Read the free book at www.howtobrew.com