Well, the idea was a good one. The technique is a good old tried and true method of casting on enough stitches for the perimeter of the square and then making double decreases at each corner until you get to the center, and then pull the remaining stitches tightly together. The happy accident happened when I chose to cast on too many stitches with a yarn that was too heavy. Twice as heavy, as a matter of fact. I used Peaches and Cream Double Weight Worsted Cotton yarn.
The hapless dishcloth turned out to be 17.5" square when finished. So, it quickly metamorphosized into a very cute, very pink, very nubbly envelope style shoulder bag. I lined it, gave it a cute button and crocheted button loop, and attached a nice long cross-the-body length shoulder strap. As soon as I get a minute to do it, I'll write up the pattern and post it on my free pattern page.
There's a cute flower design button, and the straps were put on simply by attaching the purse loops through the stitches at the top of the bag.
So, there it is. I'm pretty happy with this happy accident!