I'm not saying these involve the most skill, they're just ones which I like, and really sound good.
All Along the Watchtower - Jimi Hendrix - No brainer here.
My Generation - The Who - Ok, what if it is a bass solo. A bass is still a guitar. Kinda.
Sunday Morning - The Velvet Underground. Again, not necesarily the most skillful, but it really sounds nice, and hey that's supposed to be the most important thing, right?
Norweigen wood - The Beatles - another contreversial pick. Ah, guitar, sitar, same thing. well, okay, actually they aren't, but at least I didn't mention something without strings, like a drum solo! (However... oh never mind.)