There are a couple variations that can be made with the free white/blue deck. The deck can be highly creature oriented or tactically crafty.
Cards that specialize in a theme (soldiers and rouges) should be culled out, since the deck would be hard pressed to carry any specific creature theme. Taking out Helm of Fortitude and Nimble Dagger right away. Keeping the efficient creatures, creature enchantments, and spells, the deck starts to take shape:
White Knight x2
Sentry Rogue X4
Aura Finesse x1
Time Ebb x3
With 5 spells to go, throw in some harder to cast flying creatures and try it out:
Of course, this is just one deck idea and the deck can either be a blue deck with a few white cards thrown in or vice-verse.
Complete white/blue list