Back Story
Records for xirja.com according to archive.org start In early 2001. Verisign et al whois database indicates it was registered on 11/26/1999. In fact it was late 1998 just after my father had passed that I first secured xirja.com with Network Solutions and began using it.
From 1993 I have been working with parametric equations in spreadsheets to make 'spirograph' like designs: Origins Jewelry Design Catalog which subsequently became products: Xirja Design Zazzle showcase
Beginning in 1998 I started using programs such as the Terrazzo plugin in Photoshop for tiling: 2002 Textile Design Catalog which then led to the Xirja Design Cafepress showcase
In 2005 I started creating from scratch a custom Mathematica solution: Xirja Design Mathematica showcase that subsequently led to the 2008 Textile Design Catalog
In 2008 Filter Forge bacame my primary tool for creating custom density plots and all other 2 dimensional work, and was the tool used to create the 2018 Textile Design Catalog and prior to this I began publishing examples in 2011:
Xirja Design Filter Forge showcase
Xirja Design Filter Forge example 1
Xirja Design Filter Forge example 2
Xirja Design Filter Forge example 3
Xirja Design Filter Forge example 4
Xirja Design Filter Forge example 5
Xirja Design Filter Forge example 6
VVVV is another tool I started using for animated 1 dimensional work:
Substance Designer is faster than Filterforge for 2 dimensional work, but is not as high fidelity: