I just got the Envelope Liners Framelits Dies (#132172) from the Holiday Catalog. Have to say I love'em! Adds a little extra touch to your card project and so easy! No more using a template to cut out Designer Series Paper to line envelopes! Watch this video and you’ll be hooked!
Here is a quick sample for ya.
Envelope Liners Framelits Dies #132172 $26.95 Quickly and easily create custom envelope liners to match your handcrafted cards. Three sizes to line these envelopes: 3-1/8" x 3-1/8" (Square Envelopes); 5-1/8" x 3-5/8" (Envelopes from Note Cards & Envelopes); 5-3/4" x 4-3/8" (Medium Envelopes). Use with Big Shot and Standard Cutting Pads.