Check your printer settings you may have to clean the head or do a nozzle check... play in there for awhile and see if all your settings are ok
I have a Epson cx7400 and just printed 8 pages of 3'' circles and they came out fine. Epson would not tell me how much ink I had left because I used Kopy Kake edible ink. I will check that later. I hope this helped you some. good luck ! 
When you do your test printing, just use regular paper and only print one small image, this way you will only use small amounts of your ink until you are sure of your results and save your kopykake sheets.
Also, I find in general the color on your monitor is not going to be exactly what your prints will be.
I also found you have to play around with the paper settings on your computer. I can't recall but I think the color comes out best on mine when it's set to something like "presentation" paper. Keep at it but as a pp said, don't print a whole lot each time you do a test so you don't waste too much ink.
Good luck, you'll get it!
Try this site for instructions http://static.tigerdirect.com/pdf/epson-CX8400-InfoGuide.pdf
Are they clogged?
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