How to design anything?
Short answer
Plant a tree, expect flowers.
Long answer
Design is not a straight-jacketed, isolated thing. It lives in dance, music, prayer, stories, clothes, a stone dropped in a river. When you design anything, the question worth asking is: will this tickle the senses of whoever experiences it? If not, something is still missing.
The best designs go beyond expectation. They evolve. They surprise. Like a sapling planted with a dream, the real result shows up ten years later, in a form you never quite anticipated.
So the practice is this: combine mediums, invite the dynamic into the static, and trust that design is not a finished object but an ongoing transformation. Begin. Then stay curious about what it becomes.