I built this visual designer - the POC has a very targeted focus - but it can work with other image libraries to extend into many verticals. http://www.widgetlabs.us - or contact ken at widgetlabs dot us
"Mother Earth" has a "Veggie Garden Planner" that uses images in a similar way to lay out a garden, but yours is a much cleaner looking app with much better graphics (their's are simple colored sketches).
"Mother Earth" has a "Veggie Garden Planner" that uses images in a similar way to lay out a garden, but yours is a much cleaner looking app with much better graphics (their's are simple colored sketches).