Could you make little flapjacks? You can get little packets of fruit based sweets in Tesco and Sainsburys with the dried fruit, I'm not sure they are healthy, but surely no more sugary than raisins! Humzinger fruit bars? Shiny and colourful.
How are raisins a birthday treat? I bet the staff don't take in cut up fruit and raisins on their birthday-more likely chocolate cake!! How do children ever work out for themselves a balanced diet if everyone pretends that food is just a fuel and even on a birthday you can't have anything different than a normal morning break?
I recently tried some fruit crisps called Nim's at the Foodies Fair that were really nice. Quite unusual - they had mango and pineapple mix, which were my favourite. My daughter loved the apple and strawberry and surprisingly my 6 year old son loved the orange crisps! Not sure if they're available in supermarkets but I ordered on line.