I made my first jelly roll cake this week. It didn't last long enough to get a picture of it to post. However, it was yellow cake with cream cheese and strawberry jam filling. I haven't got the trick of filling and rolling quite down -- what looks like stingy filling when the cake is flat becomes OMGODTOOMUCH when you start rolling.
I'm going to try a chocolate one next, with a filling of Nutella and cream cheese (I have a recipe for chocolate cream cheese) and a ganache frosting. Ganache, according to there recipe I found on Cook's Illustrated, is disgustingly easy to make. It's so easy, in fact, I could make it all the time and just keep some in a jar with a spoon stuck in it.
That would be dangerous.
I'll try to get a picture of the next one, if I get it rolled up right.