Back when Animal Crossing: Wild World was at its heights, Enterbrain published the "Oideyo Doubutsu no Mori Narikiri Design Book" (ISBN 9784757727144). I was originally given a copy of the book back when it was first published, but it can still be found on eBay now if you search for "Animal Crossing Design Book" or similar.
It's 162 pages long and is full of patterns for various purposes, with sections for clothing patterns, patterns for placing on the ground outside, Blanca faces, and so on. Some are Nintendo-themed, some are anime tributes, some are more general designs like suits or circuit-boards or fake vegetable-patches to place outside. Each pattern gets a double-page spread, with the left-hand page featuring a large image of the grid for copying from and the palette that's used for the pattern, and the right-hand side showing screenshots of how the pattern looks when used in various ways (clothes, hats, walls, floors, umbrellas, ground, easels - that sort of thing). (Later books of this sort from the time of Animal Crossing: New Leaf also tended to feature QR Codes as well, but this one pre-dates the series' use of those.)
Since Animal Crossing: New Horizons retains the traditional 32x32 grid for patterns, but also adds an upscaler to them, as well as offering transparency, I wanted to test how well the book's designs hold up when copied into ACNH.
The Bowser shirt fared the worst because I couldn't find a good enough palette for it and it just doesn't look great with the new pattern upscaler, the Tamagotchi design came out fine, and the prank poop is actually helped by ACNH's patterns offering transparency! I had to use different palettes to what was originally intended for all of them, but I was generally able to find suitable substitutes.
It seems that if you're willing to make some tweaks here and there, many patterns in old, pre-ACNL books like these should work just fine in the new game. I plan to use some of the other patterns in the book as part of future landscaping plans, and I'm looking forward to seeing how those turn out when the time comes.
I just wanted to give a quick update on this. With the "Pro" upgrade for the Custom Designs NookPhone app these old patterns tend to work a lot better, since that eliminates the problem of being unable to find matching palettes.
I tried out two more patterns from the book - the "Block Panel" (legally distinct from Lego, honest! ) from page 16, and the Exit-sign from page 160.
The results were good - and I wasn't expecting that from the Lego pattern, in particular, due to all of the straight edges.
Is anyone else getting on well with using ancient patterns?