We support new ways of reading files that we want to modify/generate:

% ./makemywall 1920 1080 myfile1.png myfile2.png
% ./makemywall 1920 1080 < mylist.txt
% find . -type f -name '*.png' | ./makemywall 1080 1920

This script was inspired by initial work by jstpcs
Additional features:

* breaks compatibility to have an easier interface and easier code
* can either read the entire picture to get the background color (slow)
* or pick the color of the top-left pixel (fast, default)
* doesn't scale pictures up to avoid "fuzzy" pictures
* now has a proper license (BSD-2)