Sizzix (also called Ellison Education) are a company who works with Tim Holtz and other designers to create an amazing collection of die cutting and embossing designs.
Sizzix manufacture products and tools that cut out, add dimension, emboss texture to visual arts projects, easily and quickly using high quality Die Cutting Templates, Tools, Accessories, Machines, Embossing Folders and more. Some names of die cutting templates are Thinlits, Framelits, Impresslits, Bigz ... Thinlits cut out one sheet of paper, card and some fabrics, while Bigz dies are thick steel rule templates that will cut almost anything including acetate, vellum, paper, cardstock, fabrics, felts, canvas and thin magnetic sheeting (the soft fridge magnet kind).
Mix and match all the designs to create pieces to add to all kinds of visual arts mixed media projects including cardmaking, journaling, scrapbooking, quilting, embroidery, applique and home decor.
If you can't find something you're looking for, sing out anytime. I'm here to help :)