When designing for tshirts, coffee mugs or art prints (like any print on demand site like Redbubble, Etsy, Merch by Amazon, Teepublic, etc.) it is helpful to use highquality vintage designs. Here are some free and nice quality animal designs. These are mostly birds, mammals and butterflies. The website can be a bit difficult to navigate in this video, I do a walkthrough of there these hidden gems are located.

Timestamps:
00:00 Introduction
00:41 Navigating to NYPL
02:39 Zoology Collection

Links:
https://digitalcollections.nypl.org/
https://digitalcollections.nypl.org/c...