I too really missed Gallery, and there wasn't an apk here, so I found one along with the apks for a bunch of other KitKat apps at this link (would link it, but as this is my first post I am not allowed to)
androidcentral.us/2014/01/download-android-4-4-kitkat-stock-apps-for-your-android/
androidcentral.us/2014/01/download-android-4-4-kitkat-stock-apps-for-your-android/