Each contain an embedded comment block citing me as the author. They will display well in non-animating browsers, regardless if that browser displays first or last image. They are all looping, but none loop infinitely, making them friendlier. They contain proper timings to keep them from running too fast or being CPU hogs. Place the file somewhere on your hard drive.
Letter is signed by a hand that vanishes.
Letter folds and flies into an envelope, envelops spins to reveal stamp and address. Color reduction could save a little, but its fairly small as is. Blue star spins 360 degrees. No pauses in this one. Color rediction to 2 bit could save some.