I would avoid cutting food into funny shapes and stuff. I never did that for my children. They should appreciate the food as it is or you might end up making them fussy when they see 'real ' food.
How old is your LO? In my DS nursery we can also pack things like yoghurt and the classroom assistants will feed the kids if they don't know how to use a spoon. In addition to LaDiDa00's options, I also send sliced apples, pears, peaches, apricots, carrots, grapes, which they can just pick up and eat. Occasionally a banana which the assistant will help with. You can also buy 'good' cookies (e.g. Annabel Karmel, Organix, etc.), oat bars, carrot and corn 'chips', etc.
All the best to your DS with his new adventure :)