Her is the link to the imperial officer rank chart I will put the url to each rank (new style) below you might have to have them resized to make fit in your sig if you chose to use them I found photbucket is easiest way to this basic edit resize in first box put 150 it will auto adjust the other box start with 150 size and go from might take some tinkering for some of the higher ranks as they are longer.
http://starwars.wikia.com/wiki/Rank_insignia_of_the_Galactic_Empire/old_version
cadet- http://img4.wikia.nocookie.net/__cb20050412204919/starwars/images/9/9c/MIDN.jpg
2nd LT- http://img3.wikia.nocookie.net/__cb20050412204836/starwars/images/1/10/ImpEnsign.jpg
LT- http://img2.wikia.nocookie.net/__cb20050412204704/starwars/images/d/d3/ImpLTsub.jpg
Capt -http://img2.wikia.nocookie.net/__cb20050412204551/starwars/images/f/f0/ImpLT.jpg
Maj- http://img1.wikia.nocookie.net/__cb20050412204417/starwars/images/1/15/ImpLCDR.jpg
LtCol-http://img3.wikia.nocookie.net/__cb20050412204208/starwars/images/3/36/ImpCommander.jpg
Col- http://img2.wikia.nocookie.net/__cb20050412202550/starwars/images/7/71/ImpCaptain.jpg
BGen-http://img3.wikia.nocookie.net/__cb20050412202205/starwars/images/7/7b/ImpBrigadier.jpg
MajGen- http://img3.wikia.nocookie.net/__cb20050412202104/starwars/images/0/05/ImpRADM.jpg
Lt. Gen- http://img2.wikia.nocookie.net/__cb20050412201951/starwars/images/7/7a/ImpViceAdm.jpg
Gen- http://img2.wikia.nocookie.net/__cb20050412201829/starwars/images/d/d6/ImpAdmiral.jpg
Highgenhttp://img2.wikia.nocookie.net/__cb20050412201706/starwars/images/c/cd/SWARSFLTADM.jpg
Surfmar-http://img4.wikia.nocookie.net/__cb20050412200914/starwars/images/5/55/HighAdm.jpg
Moff-http://img2.wikia.nocookie.net/__cb20050412200314/starwars/images/7/7b/Moff2.jpg
Grand moff-http://img1.wikia.nocookie.net/__cb20070105215303/starwars/images/9/9e/Moff1.jpg
Grandgen-http://img1.wikia.nocookie.net/__cb20050412195942/starwars/images/4/45/OldMoff.jpg
http://starwars.wikia.com/wiki/Rank_insignia_of_the_Galactic_Empire/old_version
cadet- http://img4.wikia.nocookie.net/__cb20050412204919/starwars/images/9/9c/MIDN.jpg
2nd LT- http://img3.wikia.nocookie.net/__cb20050412204836/starwars/images/1/10/ImpEnsign.jpg
LT- http://img2.wikia.nocookie.net/__cb20050412204704/starwars/images/d/d3/ImpLTsub.jpg
Capt -http://img2.wikia.nocookie.net/__cb20050412204551/starwars/images/f/f0/ImpLT.jpg
Maj- http://img1.wikia.nocookie.net/__cb20050412204417/starwars/images/1/15/ImpLCDR.jpg
LtCol-http://img3.wikia.nocookie.net/__cb20050412204208/starwars/images/3/36/ImpCommander.jpg
Col- http://img2.wikia.nocookie.net/__cb20050412202550/starwars/images/7/71/ImpCaptain.jpg
BGen-http://img3.wikia.nocookie.net/__cb20050412202205/starwars/images/7/7b/ImpBrigadier.jpg
MajGen- http://img3.wikia.nocookie.net/__cb20050412202104/starwars/images/0/05/ImpRADM.jpg
Lt. Gen- http://img2.wikia.nocookie.net/__cb20050412201951/starwars/images/7/7a/ImpViceAdm.jpg
Gen- http://img2.wikia.nocookie.net/__cb20050412201829/starwars/images/d/d6/ImpAdmiral.jpg
Highgenhttp://img2.wikia.nocookie.net/__cb20050412201706/starwars/images/c/cd/SWARSFLTADM.jpg
Surfmar-http://img4.wikia.nocookie.net/__cb20050412200914/starwars/images/5/55/HighAdm.jpg
Moff-http://img2.wikia.nocookie.net/__cb20050412200314/starwars/images/7/7b/Moff2.jpg
Grand moff-http://img1.wikia.nocookie.net/__cb20070105215303/starwars/images/9/9e/Moff1.jpg
Grandgen-http://img1.wikia.nocookie.net/__cb20050412195942/starwars/images/4/45/OldMoff.jpg