"...subjects I feel like I've just taken enough pictures of and don't need to photograph any more..."

I hear ya. Recently I've been wandering around in the snow and I'm thinking "yep, snow, been there, done that, me and the world's wife, so how the hell can I make snow pics interesting?" And it's a real struggle, but then if I don't take pics of the snow, there's bugger all else to shoot!