app background design (replicate a sample image mock up)

This is a very easy job...i need someone to create an adobe illustrator file for me that replicates the mock-up in the attached file. This is going to be used as a background for an iphone app so please size the image accordingly (please make the pixel size as large as possible, this way when i scale it down no blurriness or loss of image quality will occur). I need one done at the 320 x 480 size and one at 2x that size (640 x 960) PLEASE READ: The attached files shows what I want done...if you'll notice, the image has two different shades of yellow. However, my problem is that the colors aren't spaced throughout the image in a proportional manner and I don't know how to do this. So, I need someone who can replicate that image BUT make it completely symmetrical. This is a VERY easy job, it should take no more than 30 minutes. Need it done ASAP, within 3 hours from now! The sooner the better! I WILL ONLY PAY $10 FOR THIS JOB BECAUSE IT IS VERY SIMPLE.