image: design sponge
cut up old envelopes with cool tiny geometric patterns
cut up vintage animal encyclopaedia + "valentine's annual for teens 1971" from Vinnies
a whole lot of cut up white card
a whole lot of card making
a whole lot of cards
Recently got a bit excited about the possibilities of used envelopes after seeing this on design sponge. There's also a whole flickr set devoted to art on old envelopes!