Hmmmm... to clarify, I meant something more nuanced than it seemed when I wrote that it was best to go "all the way" with a theme. What I really mean is that if, say, you're building an aggro deck, don't put control-type cards in there. Or vice-versa if you're building a control deck. However, often if you do take a theme as far as possible you may build a weaker deck. For example, aggro players will often not build the absolute-fastest-deck-possible in favour of including cards that are particularly good for the metagame, or help to increase the deck's resilience and/or consistency. There is a good example in pauper: the "stompy" archetype. They play Young Wolf because it resists being killed, even though that slot could be taken up by a one-mana, two-power creature instead (eg. Jungle Lion or Pouncing Jaguar).
Anyway, I hadn't caught on exactly that the desired theme is populate, rather than just tokens. Personally, in trying to build a populate deck I think even the strongest possible build will still far short of what is possible with a general token deck. Of course, there really is no substitute for playtesting. I highly recommend downloading Magic Workstation (and supporting the guy who made it by buying the full version) and trying your deck against established archetypes found on the mtgpulse.com. You will learn tons about deckbuilding, but it can be surprisingly time-consuming, I must warn. Anyway, here would be my first attempt at a populate deck, if it helps:
Creatures
2 Armada Wurm
3 Centaur Healer
4 Thragtusk
2 Trostani, Selesnya's Voice
2 Vitu-Ghazi Guildmage
Enchantments
4 Oblivion Ring
2 Parallel Lives
Instants
2 Rootborn Defenses
4 Selesnya Charm
Planeswalkers
3 Garruk Relentless
Sorceries
4 Call of the Conclave
4 Farseek
Land
8 Forest
4 Gavony Township
2 Plains
4 Sunpetal Grove
4 Temple Garden
2 Selesnya Guildgate
Sideboard: silklash spider, sundering growth, rest in peace, etc
At the end of the day, I believe you'll do best by playtesting using either proxies in a computer program or live ones if you have patient friends or don't mind making proxies of multiple decks. To have the most success, you'll want to try a deck against "the gauntlet", meaning the set of maybe 4 or 5 of the most successful standard decks.