DALL-E 2 open source implementation - https://news.ycombinator.com/item?id=31228710 - May 2022 (152 comments)
Also:
X-Transformers: A fully-featured transformer with experimental features - https://news.ycombinator.com/item?id=27089208 - May 2021 (37 comments)
Text to Image Generation - https://news.ycombinator.com/item?id=26615791 - March 2021 (88 comments)