crowdfunding/donation tool: pings users about disastrous events around the world, with Lens creating a wallet for people to donate to. Then Lens can transfer all the donated coins to wherever it is needed.
filtering (in case I don't like cats I don't want #cats pictures in my feed)
blog publication tool on lens
maybe a simple paint tool on lens?
a tool for users to use & understand IPFS and its technology better, i.e. IPFS-desktop, but on lens protocol
a way to "batch" content. for example your remix game. if collecting a post publication somehow was inclusive of all comment publications you would have a new primitive of sorts. ( same goes for comments under comments ). conversations become some sort of unified entity that is ownable. this probably is a very complex task at the protocol level. but since we are brainstorming...