Recently Ponytails showed me something online about a 1984 Dr. Who knitting book. Since then we've found out that there are tons of crafty bloggers and message-boarders out there who are knitting, crocheting, baking and otherwise recreating not only the succession of Doctors, but various Companions, the Tardis, and so on. Some of these are funny, some are just cute...but some of the message board posts might not be totally family-friendly, so be warned.
Fimo & Sculpey Tardis
Fifth Doctor Crocheted Gingerbread Man
A Whole Set of Doctors (I like the William Hartnell)
Tenth Doctor, on Snuffykin's Journal
Rose Goes Back to the '50's (the Idiot's Lantern episode) , also on Snuffykin's Journal
A roundup of characters made from Snuffykin's patterns
Enjoy them all!