These textures have been based off of Jappa's test resources for 1.14.
Pack Format by VanillaTweaks Developers

The maps, snowball, diamond, snow block, soul sand, obsidian, diamond block, gold block, emerald block, lapis block, glass, pumpkin, melon block, and tnt were all NOT made by me. All credit goes to Jappa.

Everything else was adapted from existing or test textures (e.g. the jack o'lantern is a combination of Jappa's pumpkin and the modern jack o'lantern.)

The sand template in the main folder is a color map of light-to-dark of Jappa's sand texture, which I used to make the sand and concrete powder.

There are a couple of extra changes that I would like to see myself; the outlines of tools and armor have been saturated, ender pearls and eyes of ender have been retextured with a 2-pixel center, and regular sandstone has a 6-sided texture.