Developing effective graphic design solutions is an analytical process. “Inspiration” comes from analyzing the client, their product, their operating model, the customer experience they offer, their competition, their market, untapped market segments, and more. That analysis provides ingredients for an “inspiration” cocktail that also includes observations of tendency, opinion, and climate. Throw in some instinct and experience, along with the technical aspects of planning for application, execution, timing, and deployment.
There are no web sites that offer this.