There are a couple variations that can be made with the free white/green deck. The deck can be highly creature oriented or creature control heavy.
Cards that specialize in a theme (soldiers and wolves) should be culled out, since the deck would be hard pressed to carry any specific creature theme. Taking out Helm of Fortitude and Llanowar Charm right away.
Keeping the efficient creatures, creature enchantments, and spells, the deck starts to take shape:
Obsidian Golem x3
Dauntless Soldier x3
Initiate Soldier x3
White Knight x2
Guided Strike x3
Holy Strength x3
Silence x1
Elvish Warrior x3
Llanowar Elf x3
Lone Wolf x2
Pathfinder x4
Elvish Agility x3
Giant Growth x3
Oakenform x3
Plummet x1
This selection gives 40 cards to try the deck.
Variation example
Some of the less efficient creatures (Obsidian Golem) can be switched out for more creature control cards (Entangling Vines and/or Dig In) or better cards from the free booster.
Of course, this is just one deck idea and the deck can either be a green deck with a few white cards thrown in or vice-verse.
Complete white/green list