The other method I like to use is transferring to contact paper or packing tape. Julie Fei-Fan Balzer has produced a one-minute YouTube to show how to do this which I share here.
She demo's with packing tape, and says to use a magazine image. I have also done this exact thing with sheet music, book pages, and photocopies, and used contact paper (that you cover school books with) for larger images, all to good effect. The great thing about this method is that it doesn't reverse your image so you can use music or words.On this postcard I photocopied both the quote and sun image and then transferred them to contact paper.
Hope you enjoy having a go at these techniques.