Two of my many digital collage sheets.  Find more here.

A digital collage sheet is a collection of high resolution images saved as a PNG, JPEG or PDF file. These images are used in an assortment of craft project including card making, scrapbooking, and jewelry making. Collage sheets come in a variety of sizes with the most popular sizes being: 1 inch circles, 1 inch squares and scrabble tile size.  Before purchasing any collage sheet always verify with the supplies their terms of use and their sources.  You do not want to purchase any images that are gathered from the internet.  These are usually very low in quality and illegal.  The best collage sheets are made with vector images or professionally scanned and copyright verified images.