Simple Illustration needed

Hello, I am in need of a simple illustration. Please see the attached image. This image was made by me, but somehow i dont like the way it shows. I need some one to make something like that with square pixels as well as round pixels. It should be very colorful and the final image should represent pixels filling in a round. I hope i am clear with my requirements. I need this very soon and would be choosing the winner in no time. Please bid with sample mockups. Final deliverables should be in .Ai format Happy Bidding...