I spent a recent afternoon making a Memphis Group-inspired/80s and 90s geometric pattern generator. You can play around with it here, pressing Generate to instantly make a unique canvas. This HTML5 project will randomly place, scale, and rotate premade shapes across two different design types. When you find a design you like, you can press the Download button to initiate a download of the design 1:1 scale. This feature works as intended in most modern browsers, but sees fault on mobile. This fix, as well as seamless, tile-able patterns, are next on my to do list should I decide to expand.
You can view the project repo on GitHub here.