Same problem here
I have a great amount of pictures in my SD card and when I try to delete some of them, they keep coming back a few hours later. I tried deleting them with the built-in app like some of you suggested but I didn't work. I've also tried disabling Picasa Sync and Google + instant upload, it also didn't work. I just recently acquired this phone and it already came with the Kik Kat 4.4 update. I'm new to Android so I might be doing something wrong, I don't know. Does someone know how to fix this?