Checkered Backround
So, you want a checkered backround, eh? Read on!
1. First you open a new image, make SURE it's transparent.
2. Now, on your keyboard, at the very top, is F1, F2, F3, etc. Go all of the way across until you see Print Scrn / SysRq Press it!
3. Now right click on the blue canvas, press PASTE AS NEW IMAGE.
4. Get your crop tool, and crop the image. See Here
5. Now, crop until you have FOUR exact squares, all of the same size. Like this> 
6. Now open a new image, whatever size you want, go to your flood fill tool, click "patterns" (It's under the color, it says, STYLES, click the -> (arrow) and and it will have 9 dots. Click it! Need Help?
7. Now press the flood fill onto your new image, and VOILA!

If you have problems, Contact Me