Custom Safety Products is a SAAS based product customization platform that was built by Aperture Labs on the nopCommerce platform.
The first customer of CSP was fastenal.com, a several billion dollar industrial supply company. CSP powers the "logoit" program on Fastenal.com. Currently high viz vests, safety glasses and hard hats are customizable through the CSP platform. It is visible here - https://www.fastenal.com/products?r=~|iscustomlogo:Yes|~&showHide=true&intcmp=hp_third-custom_logo
As with all Aperture Labs projects, no core code was modified. This was achieved entirely through custom plugins and themes.