I have a powerbook g4 15inch double-layer sd and i want to find fun projects to do.Also, i have a ppc mac only for half year so i don't have much experience.English is not my native languages so expect some mistakes
You can make movies on it. Current versions of iMovie, Final Cut and Final Cut Express won't work, but all three of these apps have PPC versions, and all work well on G4 systems.