Brandon,
OK, it was real easy, once I figured it out. What I do is right click on the patch I want and Save the image into a folder in my pictures (you probably already do this). Open a new "Word" document and copy each patch you want onto the word document. You can move and resize the patches all you want there. Once you have what you want, highlight, copy and paste into your "Paint" program. As you probably know, you already have the "Paint" program which comes with computer.
Go to Photobucket, Imageshack, Flicker, or whichever program you use, and upload your paint image into it. From there just put your new picture into your signature line as usual.
Let me know if you have any problems.
Steve