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From Wizard101's perspective, Aquila is a very small world, but I think it's just taming in potential for more additions, like furniture items.

One thing I think it would be cool, though, is after you beat Mount Olympus, Khalkos Coppersmith would also included 7 craftable Lore spells, one for each school. They would still need Treasure Cards to craft, but instead of going around Aquila battling for them, I think Khalkos could offer recipes to craft the Treasure Cards as well as the spells.
Many players often make spells themed after the Immortals, which is not bad. Most Lore spells, however, are themed after a pre-existing creature's natural attack. I've found a few Aquilan monsters that would make nice spells...

Bronze Praetorian
Pips: 5
Acc.: 70%
570Damage. -1 Charm, -30% Accuracy.

Eagle Centurion
Pips: 5
Acc.: 75%
340+210Damage over 3 Rounds. Steal 1 Charm

Imperator
Pips: 5
Ac.: 80%
400-500Damage. +35% to next Damage spell

Namean Lion
Pips: 5
Acc.: 85%
120+420 Damage over 3 rounds. -25% Damage

Ladon
Pips: 5
Acc.: 80%
50Damage and 385Damage, Stun to all enemies

Elephant Warrior
Pips: 5
Acc.: 90%
295-395Damage to all enemies. +40% to next Spell

Ophidian Archer
Pips: 5
Acc.: 85%
430-490Damage. +25% to all Damage Spells

I was trying to keep it pretty simple with each of them. Tell me what you think.