I'd suggest taking a look at Lisa McCormick's finger-picking series... finger picking will add a whole new dimension to your playing. Its a little tough at first, but once you learn a couple of patterns, learning new ones gets easier. She also does a fantastic job at giving you bite-sized chunks to work on so you don't get overwhelmed.

Also consider buying a capo. Using a capo in conjunction with finger-picking can give your guitar playing a rather complex sound when in fact what you are playing is quite simple. I've come up with neat sounding guitar parts & songs using a capo that sound quite intricate, when in fact I'm never fretting with more than two fingers at a time. I just add the capo to a fret, then experiment with different fingerings using a finger-picking pattern that I learned from Lisa's lessons. Its really fun, and pretty easy to come up with nice sounding stuff.

Good luck!