What should I use...

[DoctorOctopus]

I use koi, the few times I do use dividers. They're pretty and fairly common.

[stealthy]

I use Axolotl eggs. They might not be quick and easy to get, but they work well as dividers.

[SunsetVWF026]

I use whatever eggs I find. I'm not exactly the patient type; all that matters to me is that I get the divider.

[TNHawke]

I say pick what ever you find attractive. I started using Puvia and Leviathan eggs because i thought they were the prettiest and easy to come by. They're also not components of any quests (yet), so I don't have to feel bad about taking them and freezing them when someone might actually need them.

[SaxonDarkAngel]

I use frozen platy eggs. It started out with just some for lineage dividers, but now I hold the (unverified) record for most frozen platy eggs at 0.00%

[CicutaLupus]

I use Puvia and Phoenix eggs. Puvia because they're rainbowy and pretty, and Phoenix because... well I'm a pyro and like the little eggies that are on fire.

[freakazoid]

For me, it depends on the creature. Since I'm OCD with my creatures, the color of the egg has to match the color of the things I want to divide.

[SaxonDarkAngel]

Pink Hand Grenades.