During the last year and with the help of several swatch collecting friends (thanks, you know who you are!), I managed to add some autographed swatches to my collection. I also have an autographed Access To Space but this is mounted in an acrylic display so I can't scan it at the moment. My Access To Space looks almost the same as the one on display at Rob Allsopp's site except that mine is autographed in silver (much rarer :-).
There are several ways to collect autographed swatches:
From left to right:
A friend sent me a picture of a complete SKIN set signed by supermodel Tyra Banks:
More signed swatches. From left to right:
Here is a Funky Staff Candy Dulfer MusiCall signed at the opening of the Amsterdam Swatch Store on 20-NOV-97:
Here is a picture of the Stiletto artist swatch signed by designer
Cisco Jiminez:

Here is a picture of the Ticking Brain artist swatch signed by designer Jo Whaley:
Here is a picture of the Wired Musicall swatch signed by designer John Hersey:
Here is the Karlsruher SC Access signed by German soccer world cup champion Guido Buchwald [now playing for the Karlsruher SC]:
Here is a Lady & the Mirror artist swatch (in japanese special packaging [1000 pcs]) signed by designer Miran Fukuda:
Here is the London city swatch (with signature on box) signed by Designers Republic (Liz Close et al.):

Here is a picture of a Gold member card signed by Nick Hayek: