Paper doilies make delightful, lacy sleeves for hand-delivered valentines. Fold different kinds of doilies to show off particular elements of their patterns -- a starry mandala, a ring of wheeling snowflakes, a fragile open heart. With the embossed side of the doily face up, fold in the sides, then fold up the bottom. Cut a piece of tinted art paper to fit neatly inside. Write something flattering and true, and seal the envelope with the tap of a glue stick. The contrasting color dramatizes the lace pattern and hints at the tender message within.