PsGimp is a painting tool for PSP, with
– a pen tool
– a paintil tool
– a screen-filling tool(with gardient)
– a a text-tool
– and a draw-line tool

You can set the height and the width of the image, and you can save it as .jpg, .png and .tga, so you’re able to design XMB-waves on your PSP.

http://forums.qj.net/showthread.php?t=143688