After talking with Brittany, I thought about how I really wanted rolls that would truly stand out. Also, per my last experiment, I realized that the usual jelly roll with jam was going to yield incredibly small jelly rolls. I’m thinking, however, that it might be good to increase the amount of filling in the middle to kind of flesh it out a bit. This beautiful jelly roll is a good example of what I mean:

Also, in reading some of the recipes, I’ve discovered that frosting commonly comes with butter, but that an acceptable alternative could be more cream cheese (beaten until smooth). So I found several recipes that sound pretty neat and worth trying out, but with some minor edits to the overall recipe:
Pumpkin Roll with Cream Cheese filling : my edits would be to add the nuts to the cream rather than to the cake.
Chocolate/Espresso jelly roll with green tea and matcha filling : my edits would be to turn it into a jelly roll… make a pan of it, then add the matcha on top, and the green tea frosting on top of that.
Red Wine Cake and Cream Cheese : my edit would be using white wine (sauvignon blanc) with a chocolate cream frosting (from here).
Vanilla Cream Roll : provides the baseline for all the recipes
Carrot Cake and Cream Cheese : for the kids!
Strawberry Jelly Roll : there isn’t anything fancy about this, except that perhaps we could flavor the filling with mango/kiwi instead?
Key Lime Jelly Roll : Maybe I can do a lime one with sweet jasmine-flavored cream. Will have to find jasmine syrup though.
What about strawberry cake with black sesame frosting? Might be something to look into.
More to come; some good places to look might be in the paste sections, food pairings, and jellies.