I am a beginner myself...About 2-3 months now I believe. I am not sure what keeps me intruiged after 12 goes of say Ikkyo but I find it great fun still.
Why not try something really different. Jodori. I tried to do Ikkyou in Jodori the first time a week ago and it was very interesting indeed. To use the Jo instead of the oppenents arm really puts a spin on it.
Another way might be to really show those guy/gals how much use it could be in a real fight. Try to give them danger. Many newcomers look for it but Aikido seems so friendly at times. Put a knife in the opponents hand or something(no real blade).
As I said I'm new so don't take my word for it.