Hehehehe, time to throw out some of my thoughts. x3
Stars/Moon/Sun
All the Planets-- would love it in Dires, I want my Mars Dire, that rusty red is beautiful, just don't involve aliens. Px
Snowflakes
Weather; thunderstorm, hurricane, tornado, wind, sunny, cloudy, blizzard, etc.
Music instruments, maybe even a conductor or just a music sheet/notes one. X3
Medieval style
Victorian style
50s style
Nationalities-- I want a German pet. <_<'
Clocks, like them old grandfather clocks or pocketwatches
And well, I personally would love to see what y'all could pull off with the Western/Chinese Zodiac in y'alls hands. ;3 Though it would be awesome if you can somehow associate the Cat(from the Vietnamese Zodiac) into it, the cat doesn't get much love-- dang, Rat pushed him off into the river(no offence to those that are Rats). <_<
Windchimes/windmills
Snowglobes
Rustic/Antique
Candy(other then gummybears)
Hourglasses
Pirates! xD
Stuffed Animals
Neon/Glow-in-the-Dark (yes, I realize the green paint dire pygmy has a glowstick but that doesn't really count)
Birthstones- I'm a Garnet, so it'd be cool to see a Garnet pet.
Carnival/Faire/Circus
Teacups
Precious metals
I could go on and on, but I'm going to stop here. x'D