PH: S-T-U

Send 3 blank postcards that represent the letters: S-T-U (one for each letter)

eg.
S = swan, sunset, South Carolina, etc
T = turkey, Texas, train, etc
U = United States, umbrella, unicorn, etc

Send your 3 postcards in an envelope - S-T-U postcards should be unwritten and unstamped. They should be store bought only and of good quality. (No handmade/freebie/ad/zazzle). Sender's choice.