I'm definitely in agreement with the "work within your skills" advice.
My very first game started with one idea: "I want to make games, and I'm going to do it right now." I pounded it out in two weeks, and spent one more making the music and sounds for it. The game revolved around the idea of jumping from dream to dream, so each area was vastly different- Meaning a whole new tileset. Never since then have I worked on any game with as much art as that, and I still have no freaking idea how I even managed that.
Since then, I've just been completely burned out with art, because my level of expectation for it far surpassed my skill, and I would spend HOURS on a couple 16x16 pieces. The result was a horribly short, painfully linear game.
All the games I've made since then have been very minimalist, and the latest one was exclusively procedurally-drawn circles (Which are fantastic for any kinds of collision detection, by the way. I recommend it). I can put WAY more focus into getting the game to feel just how I want it to, and any design or story I end up building around it becomes much more developed. The result is a much more polished game, and it just feels way more professional because I didn't sink weeks of work into something that wasn't really vital.
Hell, another idea of mine revolves around the life of a pixel, so that's what you are: A white box. Keep the art simple and you'll be much happier with your end result.