The Hidden Temple Trim (called "Mayan Trim" before R30) can be crafted in your Crafting Menu (default key "Q") or at Crafting Tables (that still exist in worlds created before R22 on September 16th 2015), but only after the crafting-recipe has been unlocked upon buying it in the Store as a part of the "Mayan Pack" (since R24 in November 2015). To craft 8 (blocks of) Hidden Temple Trims, you'll need (as of R24 in November 2015):