Below I have provided a downloadable grid system PSD for Bootstrap development. This is a good starting point for a designer following my recommendations for being a designer that developers love. The PSD includes guidelines and column overlays that match the default Bootstrap grid system at the largest screen size breakpoint.
Bootstrap 3.x PSD
Working with Iron Code Studio
While my focus is development, I recognize my work is a partnership with designers. I do not offer design as one of my services, rather my goal in providing this resource is to help designers design websites that translate well to code.
In addition to this PSD, I am happy to work with designers using a customized Bootstrap grid (alternate number of columns and gutter size), other responsive grid systems, or custom responsive behavior.