Thanks everyone. I made it from piZap on facebook. Really easy to do.
1. Click on piZap. Go to timeline cover.
2. Click background (timeline cover) Select the background you want.
3. Add picture
4. add stickers.
5. saved it. Then, save on your computer.
6. Go to photobucket. Upload a picture. Resize it.
7. Put it in your signature. Voila, your done.