Digital Illustrator Needed for custom vector Designs & Ideas

Hi everyone, We are currently looking for some new designs for a colour changing umbrella range. We currently sell cityscapes but we would like to expend the range and need some quirky artwork that would fit the following criteria; - The artwork should be white when the umbrella is dry, the colours appear when it gets wet. (so two artwork are required, the white version and the coloured version) - The maximum amount of colours is 5 - The theme is open, we are open to every idea - The artwork should be produced on Adobe Illustrator - The design should cover 4 or 5 panels on the umbrella (out of 8 total panels)