An effect or two can add something to an acoustic guitar sound. Generally, you can add any effect pedal or multi-efx unit that was designed for electric guitar to your acoustic setup, too. There are also effects that are made specifically for acoustic guitars.

I don't know your budget and if you prefer multi-efx or single boxes, but I guess I can give you some ideas which effects you might check out. BTW, if you gonna use effects, you have to amplify your guitar, otherwise, nobody will hear the effect but only your acoustic sound …

• not an obvious one for an acoustic guitar, but if you're playing Led Zep, why not try out an overdrive or distortion pedal?
• more often used with acoustic guitars is a reverb effect. It gives the sound more depth. You can adjust the controls: would you like to sound as if you were playing in a cathedral or in a bathroom?
• a delay - This can fill different shoes. If you keep the delay time short, it sounds similar to reverb. If you increase the delay time, you get echoes (you have influence on how many echoes and how quickly after you play a note). This can be used in different ways: - give the sound more depth, just like a reverb - slap-back echo: listen to some rockabilly songs - an echo right after the note, very short, very “hard” - playing harmony with yourself: play a note, play another note for example a third above the first: the delay will repeat the first note and if you timed your second note correctly, this will happen right when you play the second note … - spacey sounds
• a chorus: makes your sound shimmer a bit, hard to describe with few words. Often used in pop and rock songs.

Basic line: get your guitar, go to a music store and play …

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