Color tables and iconsheets for GR products, including GR2AE, GR3, and GRE. 60+ icon sheets, 200+ color tables. 357 files in total. While there's a lot of time worth of color table editing and icon design, you can take/download this collection for free (enter 0).
I also sort of create these things called graphics, which you may find useful as well; http://metgraphics.net/