I was going to package Gtk runtime with the program, but I figured it would make too large to post as an attachment here.
It also does support changing the size configuration of your panels (1x1, 2x1, 2x2, etc.)
[EDIT] The 'virtual' LedTriks preview drawing code is still a little crude, so drawing larger panels takes a little more CPU.
Included with the program is a small ReadMe file, and a couple example images.
It doesn't support user-definable color 'thresholds' yet, but that is planned.
Here is the program. It is still a little buggy yet.
The .zip file needs to be unpacked before running.
I have not built my LedTriks yet , so please let me know if a feature could be done better or different. It has no 'Undo' feature yet, and make sure you have backups of your sequences somewhere.
Does anyone still have a copy of the file from this older post? Looks like the 'LedTricks.zip' file has gone missing. Original post here.