I fixed it!
I followed mrvirginia's suggestion of deleting the Google account and then adding it again and quickly unchecking the box to sync photos. This didn't work the first time for me, but here's what did work...
Since Ice Cream Sandwich allows you to disable apps, I disabled the gallery, then cleared the data. I removed the Google account and added it again. I was sure to uncheck the "sync photos" box. Once the account was added, I enabled the gallery and sure enough, the photos were gone!
Hope this works for those of you trying to find a fix! Thanks again, mrvirginia!