Josh Steele drew up this alternate set of tiles for Ultima 4 almost twenty years ago, first in 16 colours, and then again in 256 colours. Apparently, it has enjoyed use in a few fan-made games, though the set was only released publicly a few years ago.

The set is incomplete, but Steele — as of early 2017 — has been working on finishing up the remaining tiles:

It is time to finish this project I’ve been working on for 20 years. Hopefully one a day to the full set.

You can follow Steele’s progress at the tileset’s GitHub page. Since late April, he has added or updated the following tiles:

• giant squid
• nixie
• twister
• cyclops
• rogue
• ruins
• shrine
• attack flash
• bull
• chest
• mimic
• ankh
• gazer
• wisp

You can download the tileset — still a work in progress — from said GitHub page, or from the project entry here at the Codex.