i have been thinking about this thread for several days, it's a great conversation that sparks the depths of many quilters!
Unlike others, I think you should go with your sister's idea, BUT, in a different way....
It was obvious to me that you liked "the spin" your sister suggested, because you said, "
She immediately made a suggestion that would make the whole thing much more exciting."
Here is my suggestion...Perhaps you might think of it this way, instead. Take her "spin" and change it, or add to it. For example, if she suggested adding 4 patch blocks, try coming up with your own "spin", such as HST, etc.
In this way, you will realize you ARE being creative, and will come full circle. Getting the positive results from a "spin", but the spin will be your
own!