I started working on this guy last month and finished him last night. I wanted to do a Slaanesh themed model since I have had good luck with that color scheme as of late. For the Tyranid part of the model I went with a standard Gaunt. For the Slaaneshi bits I used some leftover Daemonette legs and arms and the Daemonette musician horn.
I am happy with the way this guy turned out and am actually thinking about modeling up some more. I think these would make excellent Fiends of Slaanesh.
Wish me luck in the contest!