Hey, I'm trying to build a squirrel populate green splash-of-white deck for some fun casual play. Currently, I have:
4 Acorn Harvest 2 Arbor Elf 4 Chatter of the Squirrel 2 Coat of Arms 1 Collective Blessing 2 Druid's Call 4 Druid's Deliverance 14 Forest 2 Growing Ranks 4 Parallel Lives 6 Plains 2 Rootborn Defenses 4 Selesnya Guildgate 4 Squirrel Mob 3 Squirrel Nest 2 Wayfaring Temple

Opinions?

If you want to go squirrel, I would seriously consider http://deckbox.org/mtg/Deranged%20Hermit. He works really well in a blue/green deck where you can keep bouncing him to your hand to play him again, avoiding his echo cost.
EDIT: http://deckbox.org/mtg/Krosan%20Beast is really good as well

Since this is for casual play, the sky is the limit, right?

I personally always enjoyed pairing Lure with Druid's Call and Swarmyard. They all have to block your squirrel, do a ton of damage to him, you get more squirrels, and you regen him.

Then again, if you want to fork out a few bucks, Earthcraft pairs with Squirrel Nest to produce infinite squirrels... y'know... just sayin...