Hi @dachary
I saw your request and attached are the following.
Enough logo Favicon Zip - I made the three major sizes:
16x16: 
32x32: 
96x96: 
NextCloud Enough logo adaption - I’m happy to try more iterations but I didn’t think the white circle sat well with the others. Ideally it needs to fit the design language already in place. So I pulled one of the drawable resources in your images from Github (activity) and made sure it would sit centered next to the rest. I chose on the lighter blue color and would suggest you use the logo’s main yellow color (#F1C119) as the rollover state.
main state: 
rollover state:
I hope this helps, and please let me know if there are any problems with the files or changes you’d like, I’m happy to revisit. Also where should I upload the original .AI files so you have them on record?
Let me know what you need re- stickers.!
Thanks
Dina