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"Ancestral Blades"
I had considered implementing Living Weapon itself, but I'm not going to do that. I do think that Equipment in the vein of Ancestral Blade is a great way to get some variation on creatures, though, so I plan to have a cycle at Common and at Uncommon.

Guardian's Banner
{2}{w}
 
 C 
Artifact – Equipment
When Guardian's Banner arrives, create a 2/3 white Horse creature token, then attach Guardian's Banner to it.
Equipped creature has first strike.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Aquatic Spyglass
{2}{u}
 
 C 
Artifact – Equipment
When Aquatic Spyglass arrives, create a 2/2 blue Merfolk creature token, then attach Aquatic Spyglass to it.
Whenever equipped creature attacks, scry 1.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Reinforcement Lattice
{b}
 
 C 
Artifact – Equipment
When Reinforcement Lattice arrives, create a 0/0 black Germ creature token, then attach this to it.
Equipped creature gets +1/+1.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Brazen Crown
{1}{r}
 
 C 
Artifact – Equipment
When Brazen Crown arrives, create a 2/1 red Warrior creature token and attach Brazen Crown to it.
Equipped creature gets +1/+0, has haste, and attacks each combat if able.
Equip {1}
Heraldic Bow
{1}{g}
 
 C 
Artifact – Equipment
When Heraldic Bow arrives, create a 2/2 green Elf creature token and attach Heraldic Bow to it.
Equipped creature gets +1/+0 and has reach.
Equip {1}
Dream Tapestry
{3}
 
 C 
Artifact – Equipment
When Dream Tapestry arrives, create a 0/3 colorless Wall artifact creature token with defender and attach Dream Tapestry to it.
Equipped creature has "{t}: Produce one mana of any color."
Equip {0} ({0}: Attach to target creature you control. Equip only as a sorcery.)

At uncommon, the cycle currently provides a P/T bonus to the equipped creature and a second bonus to all equipped creatures. This might be a bad idea. I'll have to think about it. There are already a lot of anthem effects floating around, after all.

Holy Vestments
{w}{w}
 
 U 
Artifact – Equipment
When Holy Vestments arrives, create two 1/2 white Cleric creature tokens with lifelink, then attach Holy Vestments to one of them.
Equipped creature gets +0/+3.
Equipped creatures you control get +1/+0.
Equip {2}
Mirror Shards
{1}{u}
 
 U 
Artifact – Equipment
When Mirror Shards arrives, create a 1/1 blue Faerie creature token with flying, then attach Mirror Shards to it.
Equipped creature gets +0/+2.
Equipped creatures you control have hexproof.
Equip {2}
Ceremonial Cords
{1}{b}{b}
 
 U 
Artifact – Equipment
When Ceremonial Cords arrives, create an [Insect].
Equipped creature gets +1/+1.
Whenever an equipped creature you control dies, each opponent loses 1 life.
Equip {1}

Enhancement Enchantments
These cycles create a token and give a bonus to that token's creature type.

Apprenticeship
{2}{w}
 
 C 
Enchantment
When Apprenticeship arrives, create two 1/1 white Citizen creature tokens.
Whenever a Citizen you control blocks, you gain 1 life.
Commerce of the Shoals
{2}{u}
 
 C 
Enchantment
When Commerce of the Shoals arrives, create a 2/2 blue Merfolk creature token.
At the beginning of your end step, you may tap or untap target Merfolk. If you tap a Merfolk this way, scry 1.
Resilient Infection
{b}
 
 C 
Enchantment
When Resilient Infection arrives, create a 0/0 black Germ creature token.
Germ creatures you control get +1/+1.
Sunward Boughs
{4}{g}{g}
 
 C 
Enchantment
When Sunward Boughs arrives, create a 5/5 green Treefolk creature token with Trample.
Treefolk creatures you control have reach.

Pegasus Breeding Program
{2}{w}
 
 U 
Enchantment
When Pegasus Breeding Program arrives, create a 2/3 white Horse creature token.
Horses you control have flying.

Note that the Germ enchantment, because of the necessity, would be the only on at common to provide a P/T bonus.

Aurora Anthems
This uncommon cycle grants a stat bonus and one other bonus to creatures of a certain color.

Aurora of the Blessed
{2}{w}
 
 U 
Enchantment
White creatures you control get +1/+1.
Whenever one or more white creatures you control attack, you may tap target creature.
Aurora of the Hidden
{2}{u}
 
 U 
Enchantment
Blue creatures you control get +0/+1.
Spells your opponents cast that target blue creatures you control cost {1} more to cast.
Aurora of the Taker
{1}{b}{b}
 
Enchantment
Black creatures you control get +1/+1 and have menace.
Aurora of the Breaker
{2}{r}
 
 U 
Enchantment
Red creatures you control get +1/+0.
Damage dealt to and by red creatures you control is dealt as though its source had faze. (Use power rather than toughness to determine lethal damage to creatures marked with faze damage.)
Aurora of the Giver
{1}{g}{g}
 
 U 
Enchantment
Green creatures you control get +1/+1.
Whenever a green creature arrives under your control, untap target permanent.