I'm a do it yourself kind of girl. So when I saw Facebook pages with cute modified tabs I couldn't sleep until I figured out how to do it myself. Thankfully it's pretty easy to do so I didn't really loose any sleep over it. These simple change makes such a difference in the look and feel of your business page. So let me show you how to do it.
Before you begin make sure you have some replacement images that are 111x74 pixels in size. If they are not this size they will not load to Facebook. I designed my own in Adobe Illustrator but there are free ones floating around on the interwebs.
When you hover over your tabs you will see a little edit button appear in the upper right corner
Then this "Edit Etsy Theme Shop Settings" box will pop up where you can change the name of your tab or the image. To change your image select "Change".
Then you will see this "Upload a Custom Image" window.
When you hover over the image you will see the edit button appear. Click on it.
This magic upload box will appear. Make sure you image is 111x74 pixels or it will not load (believe me I tried). I designed my "tab pretties" in Adobe Illustrator, but you can use any image editing program as long as the final image is the correct size.
Choose the file you would like to use. It can be a JPG,GIF, or PNG file type.
Once chosen the image will appear on the screen like this. Yay!! You're gonna have pretty tabs!
Then just change the rest of your tabs to match. I hope this helps you pretty up your business Facebook page and if you have any questions at all please ask.
Credit: I found some very informative tutorials on how to do this on Cypressnorth.com and Allfacebook.com