There’s no worse feeling for a composer than looking down at the blank page and getting an overwhelming feeling of “now what?”
It’s in trying to conquer that feeling that this project came into being.
Perhaps you’ve seen those little trays at convenience stores that say “Need a Penny? Take a Penny. Have a Penny? Leave a Penny.” That’s akin to how this project works. Here you’ll find germinal notions or broad concepts that could be taken in any number of directions. If you need something to get your mind moving, hopefully you can find it here. Or if you have such ideas yourself, hopefully you’ll share them for others.
To sum it all up:
If you have an idea, share it. If you need an idea, take one.
Note: Over the years, I’ve taken much impetus from Vincent Persichetti’s seminal “Twentieth Century Harmony.” The book is a gold mine of ideas and I’ve listed some of them here to get things started. The numbers in brackets refer to page numbers in the book.
-develop musical materials around particular intervals (“zones” of interval deployment; one phrase could explore seconds, the next fifths, etc.) 
-use lines of chained intervals contrapuntally, as you would with single melodic lines 
Get more ideas from my book Composer’s Toolbox: Practical Ideas to Inspire