Mitochondrial DNA and chloroplast DNA are inherited from maternal side of a cross. Mitochondria DNA mostly responsible for the function of mitochondria, while chloroplast DNA mostly responsible for function of chloroplast. So, these DNA are related to the plant growth. I am not sure how these two (mitochondrial DNA and chloroplast DNA) related/contributed to the shape of the flower.
Coming back to "One of the parents has a shape that I really love", if you could figure out whether the shape is dominant or recessive in nature, you could at least make an educated guess. This picture is an example of how I observe the physical traits:
Some pictures are from the internet.
In first and second hybrids in picture, you can see that V. vietnamica lip is non-dominant. Both parents for third hybrids have rather similar shape of lip but V. vietnamica has more frilly lip, hence, the offspring inherited that. But if both parents have distinctly different shape from each other, the resulting offspring will be intermediate of the parents. This is how I make an educated guess whether a trait is dominant or recessive in a cross, from observations after few years of growing orchids (only in Vanda though). Hope this will give you some ideas.
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