Almond butter maybe and jam.. If they can do nuts and not allergic. I don't like nutrella but others do . What about marshmello cream and pb? Depends on age too.. I cut the crust off good wheat bread so it's more edible for a picky kid and i eat the crust for breakfast..
Pb & j and add chopped walnuts for a little crunch or candied pecans chopped up ..maybe the kids don't like nuts..? Then turkey on goldfish shaped bread..