Mosaics...How do you do that!?!?!?!? And Yard Sale Find!

I really want to do some picture mosaics, especially for my header picture. I don't have a clue how you are doing this! Also, your blog names are so pretty, not just in the standard placement, and all I know is how to do the standard way using the blogspot settings. Can anyone enlighten me here? My blog is outdated! Would love to learn!
Then, I found this print from the early 1800's at our friends yard sale. I Love prints of children looking at birds, and fell in love with this one. As you can see, it was quite worse for wear, but I didn't care I knew Ken could work his magic.
And he did! The holes are gone, the picture lightened, and now I have a wonderful addition to my pictures, will be beautiful on one of my crazy quilt pillows! If you would like to save this picture, go ahead! I don't blame you!