When I discovered this error, rather than undoing the afghan and starting over, I decided to continue. This way I would be guaranteed it would meet my size requirements. As I went along, I forgot how to end a row and start the next one and the roommate that new how to do this had moved out. Oh well. I persevered. Eventually I notice that the ends were growing. Now my already enormously long afghan was even longer, but there was no way I was going to undo that much work. Again I continued on.
I decided since the afghan was so big, I would make it wide enough to pull up under my chin and tuck under my feet. This would then enable me to share it with any family members that were on the couch with me, since it was as long as the couch.
This trapezoidal afghan is definitely a craft gone awry. For many years I just used it occasionally and took it along to family reunions for the cold evenings, where it was shared among many family members. Now that I have children I have found many more uses for it that I never imagined.
I fold it in half each direction and put on the hardwood floor as a pad when putting the children to sleep. It makes a pretty good mattress.
I fold it in half lengthwise and spread it on the lawn for a picnic / looking up at the clouds blanket.
I believe it's even been used as a dragon, since dragons are very long.
Just the other day, it was draped from one piece of furniture to another (full length) to create a tent. Something it definitely would not have been able to do had I gone the boring, traditional route of those that actually know what they are doing and make afghans of a normal size.
So when a craft goes awry, maybe it's not as bad as you think. And if it is, then at least it's good for a laugh.