I am no artist, just a coder. What would be your approach to organic looking ships, other than tentacles?
Well, I'd always imagined them looking a bit like Moya from Farscape - nature strives for perfection, and a famous proverb states: "Perfection is not when there nothing left to add, but when there is nothing left to take away." No superfluous elements, no bling, just what is absolutely neccessary to do the job. No extra wings that have no function. No masses of tentacles when maybe two or three could do.
Insects are the same - only exactly those appendages that are needed - the rest is well hidden away under the exoskeleton.
I'd go for an extremely smooth, rounded approach. Sharp angles are found nowhere in nature.