I don't know about compiling a custom kernel, but if you're wanting to try something new and have YSMenu, try DSision by spinal_cord: http://gamebrew.org/wiki/DSision2
Also, you can select a theme using the start/select button. I don't know how to make a custom theme yet, but I might try to find out sometime.
For some reason it just boots to green screen with time — Posts automatically merged - Please don't double post! — Hm. This is strange:if i load dsision through YSMenu, it does boot normally, but if i load it as primary kernel... — Posts automatically merged - Please don't double post! — Well, dsision2 is outdated:it writes setting not to TTMenu/ysmenu.ini, but writes it to /ysmenu.ini
