For powers, you kind of just need to decide on templates that combine XdX damage + [insert list of conditions]. The Xs in XdX grow based on tiers of some kind, and the [list of conditions] changes based on the same thing. Like you shouldn't have a level 1 character doling out multiple d10s of damage nor adding the Petrified condition, but finding the balance of what goes where in what combinations would be neat. Spellcasters might unleash nastier conditions earlier, but deal less or no damage when doing so. Meanwhile, fighty classes dole out more dice of damage or gain advantage, which is in-line with Nimble's "you only miss if the left die is a 1" schtick.
"+ conditions" can be extended to other partial actions, too, like maybe handing out a free-but-only-half-as-effective armor block for an ally or something, too. This could potentially negate the issue some folks have with Nimble regarding "not enough defensive/armor actions."