Yes there is a lot of tools for making trojans, you can merge a jpg and a exe and use it to gain acess into a system but there is not many new viruses that is not discovered by a good antvirus program and or a firewall.

dont wast your time on this if your not writing your own virus and are good at it, the only thing you have to fear if the isp dosent find out is an other hacker/cracker/script kiddie that vill try to take you fame and place.

it just not worth it, but chek on blackcode.com or packetstorm, och astalavista etc.

but be carfull some of the great makers of this wonders is giving you a virus,They vill try to exploite you naivness to make room at the topp(?) or just laugh at the fact that you got hit by the same thing you wanted to do unto others.

it's your choice.