I used a Spellbinder die to cut the window as well as a matching window in a fun foam backer OH! and I found a GREAT deal on acetate on amazon. Well, Its transparency paper, but the same thing at staples was about 3 times the price (link below).
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I'll be submitted this to the showCASe your style sketch challenge, the Simon Says Stamp: Bright challenge, the Virginia's View Shaker challenge, and the lawnscaping clean and simple challenge.