Quick design drafts to considerfor for Site (Colors/Images)

Hello, This is a quick job!, NO web development, all we want is ideas of colour matching, and a proposition of a main drawing or image to replace the one we have (which comes from a template). We want to get 3 or 4 draft designs for a site we have in development. Which means, we are not quite happy with the colours and images of the work in progress (which was made by our technical people who are not designers at all), so want to get new ideas from someone of the field. If one of the drafts turns out to be A GREAT idea, we could reinvite the provider for another bid to work more in depth with a larger concept. We don't want anyone working for free, so If you want to participate, you'll bid up to $50, Then we'll select 3 or 4 bidders (our budget limit) and send them the images of the site to work with (or access to it), and pay the $50 for all serious draft propositions. The end product we expect is to have the color matching design (jpg or equiv) (with instructions on how to implement them, i.e. degradations, colour codes, etc) and an image or drawing (free of royalties) for the main page.