I have not, but I would love one as my littlest ds is almost 3 and a lefty. He has always wanted to play with the big kids, but the gloves are all righties and he tries to throw with them as he has figured out that the glove belongs on his right hand just not that he shouldn't have to use it upside down!!
I will try to come up with a pattern, but I have been crazy busy lately and haven't had the time to design anything. I am hoping to get one done in the next few weeks as his birthday and his little friends birthday are both soon and they would both love to have knitted gloves!!!!
I will post as soon as I make any headway, please update if you find a pattern.... thanks,
laura