For my 8 white "creatures", I'm building on an existing enchantment/equipment theme with:
Dawn Evangel
Ghostblade Eidolon
Archon of Sun's Grace
Heliod, God of the Sun
Celestial Archon
Archon of Falling Stars
Ancestral Blade
Spirit Mirror
Two of these are not technically creatures, but they make creatures.
For red, I will build on a minor discard theme with two madness creatures:
Stromkirk Occultist
Reckless Wurm