I have a problem with patterns. I start out with the basics of the pattern and have really good intensions of following the instructions. Honest I do. But somewhere between reading and doing, I mess up so bad that the quilt never resembles what it should when I am done. So I quit using patterns except for suggestions.
I like the quit beating your self up if you are not creating your own. Everyone needs to be comfortable with what they like to do.
If you want to try something on your own, maybe just pick a block from one of your patterns and draw it on graft paper, color it, paste it to some cardboard, and cut on the lines and cut out all different pieces. Now play with the pieces to see how many new blocks you can create from the pieces of that one block. When you are happy with an arrangement of the pieces, copy to graft paper and start designing your quilt. This way you know the size of the pieces as you have the original pattern size. And most quilts are made up of common blocks that can be used by anyone.
Hope this helps.