QuickerSite is available on GitHub as from 2020.
You may want to star, fork, follow, download and/or contribute to the project over there. Thank you!
There are many background-pattern generators out there. There are also many websites offering all sorts of ugly background patterns :)
But there are very few, I didn’t find any actually, that generate or offer transparent background patterns or textures (transparent png files).
Transparent background patterns can be combined with background-colors (CSS). That is real fun.
Check out the video below! I try to explain how to create transparent background images using Paint.NET (www.getpaint.net). Paint.NET is a free image editor for Windows. It rocks! Never let me down in the past 7 years!