Need recommendations of songs for wedding. birthdays, love declarations.

Hello people!

I play guitar and I write my own songs. I'm recently out of job, so I wanna try start earning some money online with my music skills. I am deciding to pitch myself on Streetlance.com and offer covers, customised, personalised songs for customers to send it as a gift for their loved ones. Does anyone have good ideas of songs that are popular, known by the majority of people, classic ones, songs that people wont get tired hearing of? Like for instance I am doing a Happy birtday song cover and will personalise it for every customer to send it as a gift. But any songs for other occasions like weddings?

greets, Josiee

my fave is 'Runaway' by Bruno Mars http://www.youtube.com/watch?v=z8M77rC-WSc

or you can play some songs by John Mayer...my fave is 'Your body is a wonderland'

http://www.youtube.com/watch?v=ec0ZbevW2do

I hope dat dis two songs wil do

hope both will