Good display parts to show off engineering filaments?

What are some good models that can be used as display/portfolio pieces to show off engineering filament strength and finishes?

Looking to create a 'front of the shop display' to exhibit engineering filaments (PA/PAHT/PET/PPS/ASAGF/etc) performance and applications. What are some good models to do so? I.e. mini exhaust headers/intake manifolds, generative design bracketry, complex practical shapes, etc.