If you like the bug, but think it should be bigger than a green bean, here's the house-sized version: a new monster for 4th Edition Dungeons & Dragons.
Huge fey beast (mount)
L12 Elite Soldier / XP 1400
Senses Perception +10; low-light
HP 252; Bloodied 126
AC 30; Fortitude 27, Reflex 26, Will 24
Saving Throws +2
Immune to sleep, paralysis, stun
Action Points 1
Chomp (standard; at-will): Reach 2, +19 vs. AC; 2d6 + 5 damage, and the targey cannot also be the target of the Feyboerian Trilobite tail snap.
Tail Snap (minor; at-will): Reach 2, +17 vs. AC; 1d8 + 5, the target cannot also be the target of the Feyboerian Trilobite chomp.
Glowing Sputum (standard, encounter) • Acid: Close blast 5, +17 vs. Reflex; 4d8 + 5 damage, and the target is dazed (save ends).
Alien Manifestation (immediate interrupt, at-will): Any creature viewing a Feyboerian Trilobite for the first time is dazed (save ends).
Str 22 (+12)
Dex 19 (+10)
Wis 19 (+10)
Con 22 (+12)
Int 2 (+2)
Cha 19 (+10)
yep... it's a firefly, believe it or not.