The Scrap Project Paradox and The Law Of More Yarn Required

After finishing the lovely but long and complex shawl, I was trying to be good and go back to the stupid scrap project I've been working on for far too long (try two and a half years):

To remind everyone (though I've mentioned this project before), this is a simple log cabin squares put into a small blanket project that I started to get rid of all the Simply Soft I had laying around.  I've been working on it on and off, but during the Olympics I made a effort to get all the squares done and sewn up, which I accomplished.  I, however, only started the border before dropping it to do the shawl.  Priorities, priorities.

Anyway, this, of course, has gone the way of every scrap project, which is it fell for the Law of More Yarn Required.  The Law of More Yarn Required states that if you do something trying to use up random not full skeins of yarn, such as undertaking a scrap project, you will need more yarn to complete it than you have in your stash.  It isn't the worse thing in the world if you use all that extra yarn, but this goes hand-in-hand with the Scrap Project Paradox, which is any scrap project doesn't actually use up your scrap yarn.  It may change the dynamic or amount of such, but it never will use up all the scrap yarn.  You will always have some left.

Trying to avoid that for my scrap project, when I started the border I planned out the design so that I would use more of the yarn I had more of while still maintaining some semblance of a design.  I would not fall for this rule...and yeah:

I made the black sections way too big, and ran out of black yarn on the last side I had to do (I'm also log-cabining the border). Ten more rows of black I don't have the yarn for, nowhere, not even in my stash (for obvious reasons the half-skein of black wool I still have would not work, unfortunately).  So now I need more yarn for the scrap project I was doing to get rid of yarn. Sigh.

Not that I wasn't falling for this law even without the black yarn shortage (though, to be far, less yarn than I started with):

Best laid plans of mice and men and all that.  Next time I may do the whole thing properly; that is, weight the damn yarn and see how much area I can cover with it.  Maybe then I'll actually defeat the Law and the Paradox...or at least I can dream, right?