Anybody can, Lol.
Basically, Loveless, Leesa, Cillia, Hazu, And I make signatures. Though I'm sure a few other people do too. XD Should this be moved to the Sig&Ava Forum?
xD Try going to the Signature and Avatar part of the forums and look for "Leesa's Siggy Shop" "Cillia's Siggy Shop", Etc. Unfortunately i do not have a signature shop on this forum @_@