Here are a collection of themes that have been converted from iTerm2 themes.
iTerm2
is a macOS Terminal app that is very popular on that platform. I wanted some of
the
varied themes that one finds for that app on my Amiga (>32 colors to be safe;
not 
tested on machines with screens with fewer colors).

ViNCEd uses 16-bit RGB values and some of its preferences are a bit difficult to
grok
if you open the prefs file and expect to find 8-bit hexadecimal or integer
values for
RGB. These themes have all been converted to a format that makes sense for
ViNCEd.

The script that does the conversion is open source and the latest version can be
found
on a public GitHub gist:
https://gist.github.com/nyteshade/87a2d2c37275f9f61ddcf722b14f1200
The script is also included here, though it should be run in a console on a
machine that
supports Google Chrome.

Installation:
Each theme file has a url to an image that you can preview to understand what
the colors
should look like. Once you've chosen one you want, open the file
ENV:ViNCEd.prefs and locate
the section with the comment ";Colors:". After that, copy the lines that look
similar from
the theme file into the ViNCEd.prefs file and save. 

The next time you open your terminal, those colors should be in effect. If they
are not, 
you may need to open the Settings when ViNCEd is running or type "SetVNC"
manually. Find 
the 3rd (of 4) page under the Edit tab. Ensure that "ANSI colors as default" is
selected
and tap Use.

Once you have the theme you like, open Settings again and click on the Save
button or manually
copy the ENV:ViNCEd.prefs file to ENVARC:

Enjoy!

P.S. There are a lot of comments in the JavaScript source file that explain how
the process
works. In short, it basically grabs the pixel colors from the sample images
directly and
creates a textual output that can be saved to a file. I did this with the
handful of themes 
included in this archive.

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[unknown]                 5830   15016  38.8% -lh5- 6896 Jan  4 19:00 ViNCEdThemes.js
[unknown]                  526    1280  41.1% -lh5- b9b5 Jan  4 16:12 ViNCEd_AdventureTime.txt
[unknown]                  494    1287  38.4% -lh5- fb81 Jan  4 16:13 ViNCEd_Afterglow.txt
[unknown]                  471    1260  37.4% -lh5- 8f15 Jan  4 16:14 ViNCEd_Andromeda.txt
[unknown]                  486    1278  38.0% -lh5- a023 Jan  4 16:21 ViNCEd_Argonaut.txt
[unknown]                  522    1296  40.3% -lh5- b8e8 Jan  4 19:03 ViNCEd_BirdsOfParadise.txt
[unknown]                  496    1268  39.1% -lh5- 8377 Jan  4 16:23 ViNCEd_Breeze.txt
[unknown]                  518    1291  40.1% -lh5- 5f37 Jan  4 16:15 ViNCEd_Chalk.txt
[unknown]                  507    1277  39.7% -lh5- d896 Jan  4 16:24 ViNCEd_Ciapre.txt
[unknown]                  463    1270  36.5% -lh5- 3bef Jan  4 18:43 ViNCEd_Cyberpunk.txt
[unknown]                  463    1263  36.7% -lh5- 8661 Jan  4 18:44 ViNCEd_Darkside.txt
[unknown]                  471    1287  36.6% -lh5- 4bff Jan  4 16:15 ViNCEd_Desert.txt
[unknown]                  493    1281  38.5% -lh5- 375e Jan  4 16:24 ViNCEd_DotGov.txt
[unknown]                  520    1282  40.6% -lh5- db8a Jan  4 16:24 ViNCEd_EarthSong.txt
[unknown]                  516    1278  40.4% -lh5- 9af9 Jan  4 16:31 ViNCEd_Elemental.txt
[unknown]                  490    1275  38.4% -lh5- 8af9 Jan  4 16:24 ViNCEd_Elementary.txt
[unknown]                  492    1291  38.1% -lh5- 25c5 Jan  4 16:31 ViNCEd_Espresso.txt
[unknown]                  502    1266  39.7% -lh5- bf3b Jan  4 16:32 ViNCEd_EspressoLibre.txt
[unknown]                  439    1256  35.0% -lh5- 6c6b Jan  4 16:32 ViNCEd_Fahrenheit.txt
[unknown]                  508    1282  39.6% -lh5- 80e0 Jan  4 16:33 ViNCEd_Fideloper.txt
[unknown]                  518    1288  40.2% -lh5- 8f13 Jan  4 18:46 ViNCEd_FontEndDelight.txt
[unknown]                  504    1265  39.8% -lh5- 5024 Jan  4 18:45 ViNCEd_ForestBlue.txt
[unknown]                  506    1262  40.1% -lh5- ef84 Jan  4 16:12 ViNCEd_FunForrest.txt
[unknown]                  524    1287  40.7% -lh5- 7714 Jan  4 16:34 ViNCEd_GruvboxDark.txt
[unknown]                  432    1284  33.6% -lh5- 0313 Jan  4 18:47 ViNCEd_Guezwhoz.txt
[unknown]                  507    1275  39.8% -lh5- e0aa Jan  4 16:34 ViNCEd_Hacktober.txt
[unknown]                  485    1256  38.6% -lh5- e3d5 Jan  4 16:35 ViNCEd_Highway.txt
[unknown]                  528    1284  41.1% -lh5- c931 Jan  4 18:48 ViNCEd_Hopscotch.txt
[unknown]                  472    1290  36.6% -lh5- cb91 Jan  4 18:48 ViNCEd_IdleToes.txt
[unknown]                  511    1290  39.6% -lh5- 740d Jan  4 19:01 ViNCEd_Japanesque.txt
[unknown]                  496    1262  39.3% -lh5- ab8e Jan  4 18:43 ViNCEd_TangoDark.txt
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total        31 files   20690   53327  38.8%            Jan  6 05:08