Another useful plugin comin' atcha: NightStar3 and codestation's ZeroVSH Patcher! This plugin, when enabled, lets you load resources (.rco), fonts (.pgf), bitmaps (.bmp) and gameboots (.pmf) from the memory stick or internal PSPgo storage, effectively [soft-]modding your PSP visually, all while minimizing the risk of a brick ... because nothing is written to flash0. Cool, huh?
Load your custom files to ms0:/PSP/VSH/ or ef0:/PSP/VSH/ and fire up the plugin. How does it work?