Ran Liron discusses various methods for creative design processes when developing the ultimate to-do lists app. He advocates for exploring ideas through techniques like crazy 8 where designers rapidly generate 8 unique designs. Liron also recommends using limitations and restrictions to spark creativity, as well as researching user needs to find areas for innovative solutions. Designers can also find inspiration from unrelated domains by copying concepts and adapting them to the context of to-do lists. The overall goal is to use exploration, limitations, research, and cross-domain inspiration to develop the best design.