I cut a large piece of fabric out of some old jeans, and ironed the heat bond sheet to the back before trimming the edges. This way, the heat bond isn't wasted or accidentally ironed to the ironing board. I'm clumsy like that, so I try to think ahead.
Then, I just did a Google search for silhouettes, printed them and cut them out (or you can just freehand, which is what I did with the splat), traced around them on the back of the heat bond with the marker, cut this shape out of the heat bond fabric, and -after checking to make sure the design would adequately cover the hole in the pants we are trying to save- ironed said shape to aforementioned pants. My children now are certain that I rock.
Thing 1 got the splotch, Thing 2 got the bat.
ETA: After a few washings and dryings, the patches did start to pull away from the jeans in certain spots. Maybe it was just the type of heat bond I used, maybe I didn't heat it well enough during the initial bond, whatever... just letting you know it may happen, so it might not be a bad idea to add a running or blanket stitch along the edges of the patch once it's ironed on.
And I had another pair of jeans to recycle, so I made this little cutie... I just cut the fabric into strips and crocheted the jeans-yarn into a bowl. It looks even better filled with Mrs. Meyers laundry and dish soap samples.
