Insect themed Tyranid army: Need help

[Ravingbantha]

I recently started a Tyranid army, I've been bouncing around a few paint theme ideas, I like the idea of doing a bio-luminescence themed army, but can't find too many pics to help me out. I also have toyed with the idea of doing an insect-ish themed army, painting each unit type according to a dfferent type of insect. I've already got a few going, and some ideas for different units, but I could use some help figuring out what would work for the other units.

Hive Tyrant - scarab
Swarmlord -
Tyrant Guard -
Tervigon -
Tyranid Prime -
Tyranid Warriors -
Genestralers -
Termagants - Termites
Hormagaunt - Flees
Ripper Swarm - fire ants
Hive Guard -
Zoanthrope -
Venomthrope -
Lictor - praying mantis
Haruspex -
Pyrovore -
Shrike - Locust
Ravener - scorpion
Sky-Slasher -
Gargoyle - wasp
Harpy - Moth
Hive Crone - Moth
Spore Mine -
Carnifex - Lady bug
Biovore -
Trygon - Cobra
Trygon Prime -
Mawloc -
Exocrine -
Tyrannofex - Bombardier Beetle

[Morgrim]

There's multiple different types of scarabs, you could theme each HQ after a different coloured one.

[alshrive]

For the Tyrannofex I'd recommend the Bombardier Beetle.