If you're learning how to use Twitter and would like to customize your page to potentially make more money, I know just how to help.
First of all, there are multiple sites that do a lot of the same thing, the one I really like is free, freetwitterdesign.
com.
Free Twitter Design allows you to choose from different backgrounds or easily upload one of your own pictures.
I'm going to walk you through step-by-step how to do it.

1. Go to freetwitterdesign.
   com
2. Scroll down to "Sign in with Twitter" & select
3. Allow Free Designer Access- select "Yes"
4. Scroll down and either choose a layout or below select "Let's Get Started"
5. It will now show your page.
   You may now look to the right pane and select what you want to add for objects, "Text", "Shapes" or "Image".
   
6. Lets say you selected "Image".
   The image will appear behind your Twitter page.
   On the far right in the middle of your screen you will see Twitter Overlay.
   Select "Off" to remove your Twitter page to edit your image.
   You can drag or manipulate your picture.
   Once you've done this, select "On" for Overlay to see how your picture looks.
   
7. You may also want a different background color if your picture doesn't take up the entire screen.
   In the upper right hand corner under Twitter colors, select "Back Ground" and it will give you an array of colors to choose from.
   
8. At the lower left, select "Generate Image"
9. Then "Save As"
10. It will instruct you to go to your Twitter page to complete process
11. In Twitter account, go to "Settings"
12. Design Tab
13. Select "Change Background Image" on the bottom left of your screen
14. Then it gives you the option to find the file you just saved
15. Select save changes so you can see the results

This may take a couple of times to get the picture to look exactly how you want.
Just repeat steps 5-15, I know that seems like a lot, but you'll get it down in no time.
Then you will have a fully customized, professional Twitter page that may get you more leads if you are consistent with your tweets.