NovaCrafter
Found this from an old server profile. The galaxy theme feels perfect.
guestbook
sign in with mc-auth — it's safe and only shares your minecraft username and head. leave me a message about whatever minecraft-related or something funny. i will approve your post after reviewing it!
BlockWizard
Signing the guestbook like it is 2009. Keep posting screenshots.
CyanSteve
1.8.9 forever. Also, the profile card is very clean.