Ideas for acoustic songs to cover?

I'm a 19 year old guy, I've bn playing about 3 years, and can play a variety of different songs. I'm looking for some cool easyish songs on guitar, that rely a lot vocally. I dnt know my vocal range exactly but its pretty decent, I'm thinking about covering rolling in the deep by adele, I can play n sing it flawlessly if I move it down a step so maybe sum songs like that.