NFTs have been on Bitcoin.

Not been through colored coins yet, however there are these as well.

The first on Namecoin - d/bitcoin (April 21, 2011)  https://www.namebrow.se/tx/6047ce28a076118403aa960909c9c4d0056f97ee0da4d37d109515f8367e2ccb/ (this is a .bit domain name)

The first on Counterparty - test - (January 13, 2014) https://xchain.io/asset/TEST (the image was added afterwards)

Using emblemvault you can trade these on Opensea Eth/Polygon, as well as BSC, Gnosis (xdai) and Fantom

https://opensea.io/collection/emblem-vault

Here's a quick ad on Coval/emblemvault https://youtu.be/aBoDzzHZtY0

but also, soon you will be able to trade Ethereum NFTs on Bitcoin - https://xchain.io/asset/A709923891251641011 (this is the prototype vault)