PNC Bank has added a new twist to its annual tongue-in-cheek Christmas Price Index, which estimates the cost of gifts mentioned in a famous holiday jingle: an enhanced website that lets people custom-create toys online for the chance to win 3-D versions of them.

The toys represent gifts mentioned in "The 12 Days of Christmas," and PNC is using MakerBot for its 3D printing services. The bank will choose 24 winners daily for 12 days.

The contest, which runs through December 13, is part of the bank's Christmas Price Index, which estimates the price of the gifts described in the Christmas carol. The Pittsburgh bank's wealth management team crunches the data for the index, which gets love from media, including NPR.

To be sure, the index is meant to be cheeky but it does source data from retailers, the National Aviary in Pittsburgh and the Philadelphia-based Philadanco and Pennsylvania Ballet Company to derive its estimates (for instance, $5243.37 for ten Lords-A-Leaping).

The bank says educators can use its price index to teach economic trends to middle and high school students. (Lesson plans and student activities are listed on the website.) The bank provides the lesson plans in partnership with SIFMA's The Stock Market Game, which is a program from the Securities Industry and Financial Markets Association Foundation for Investor Education.

PNC fosters awareness of the index through media screens in its branches, banners on the PNC website, social media platforms, customer communications and advertisements in the Wall Street Journal.