Ethereum

what’s the best way to bridge a token (fungible or non fungible) from a different L1 to a L2 built on the OP stack? 

(Think of chains like Blast, BASE, OP Mainnet, ZORA, Soneium, OPBnB)) 

Anyone see any creative solutions projects have done? Are people using 6551’s for this?

Yes, there's Caddi's new page, he's always innovating https://normie.caddi.fi/

And another good bridge service, cheap and reliable is Relay

lore @optimism | ex: @coinbase | views are my own | what if it all worked out? 

Yes, there's Caddi's new page, he's always innovating https://normie.caddi.fi/

And another good bridge service, cheap and reliable is Relay https://relay.link/bridge/ethereum