If you're talking about the emoticons that come with AIM, The only ones that the other person will see who is using AIM are the ones that normally come with aim if that which you send to him has the same text makeup, as far as i know
(i.e. you send the smiley in Trillian, the person using AIM will see AIM's smiley. but if you type into Trillian brb, which i believe shows the brb sign emoticon, then the person using AIM will only see the text "brb")
If you go check out the skinning forums at www.trillian.cc, theres a skin called mcp - multi client pack. it has all the windowsskinned in their medium defaults. check it out if you want a look a like to the original aim or msn etc.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS