You can make your own by just using the 100x120 pixel dimensions (keeping within those constraints) and uploading them as your avatar. In your Profile, there is an Upload or Browse button within the avatar category for you to upload pictures to.
If you do not know how to make one, you should make a request for someone to make you one in the Avatar topic:
http://comnet.imperialnetwork.com/topic/4488/ Someone will eventually get to it.
Cleric "Cosmic" Vor'soth
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Stormtrooper Corps
Commander of Training, General
CoT/GN Cosmic/HCA-3/Tadath/VEA/VE
[OPE][OTH][OPA][EW1][CoR][CDS][IH][GS][BC][LM][SoS][CRoM][CoH][PoC][MSM][SCP][SoA][IOC]
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Dark Jedi Order
Dark Lord of the Krath, Krath Oracle
DLK-SL/KO Cosmic/Lion 1-1/Lopen/VEDJ/VE
[VP][WoS2][KC1][SoY][EoP][OAK]
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Engineering Corps
Chief Operating Officer, Chairman
COO/CHM Cosmic/Lotaith/VET/VE