So, I already know I am going to get roasted for this thread. Gnomes are my all time favorite race. Sadly, there is a ton of gnome hate perpetrated by a select group of jerks making it all the more difficult to express ideas about Gnomes. Here goes:
I'd love to see Gnomes study with Night Elves to learn the ways of the Druid. One of two things could happen. 1) Blizz could simply offer either Nelf or Worgen Druid forms when trained. Or 2) they could use existing skins from Battle Pets, like the ones below:
Guardian Form - Dun Morogh Cub (fitting for the region)
Feral Form - Snow Cub (also fitting for the region)
Moonkin Form - Hatchling from Alliance
Treant Form - Ruby Sapling
Travel Form (Cheetah) - Cheetah Cub
Travel Form (Stag) - Fawn (fitting for the region)
Travel Form (reg) - Gilnean Raven
Travel Form (swift) - Snowy Owl
Aquatic Form (in place of sea lion) - Left Shark (or Land Shark)
Aquatic Form (possible Glyph) - Mr Chilly Penguin
*Please note, these are older images from warcraftpets.com. In game versions are much nicer and Blizz could certainly just take the existing Night Elf, or Gilnean forms and reduce their sizes by 50% to accommodate a Gnome Druid without having to create ANY new artwork.
That said, it would also be possible to use the robotic versions of battle pets and make a mech-style Druid suit that emulates Natural powers and simulates the animal shapes and abilities. Ultimately, the tech version makes more sense, but the battle pet version is far cuter.