M.-
For the past 9 years, I've been deeply involved in diabetes and working with Certified Diabetes Educators/Dieticians in an effort to help people better manage their diabetes.
It's really kind of you to be concerned about the kids. The truth is, kids with diabetes can eat anything. They'll know how much they can have, and the school nurse can help them adjust their insulin levels to match the amount of carbs they are consuming with the treats if they're Type 1. Type 2 is much different - do you know what kind of Diabetes the 2 kids have?
I'd just make sure to take the nutritional information (if it's store bought or even from the box if you prepare something) to the teacher and the school nurse so they can make appropriate accommodations.
I'd highly recommend NOT bringing something for them that is sugar free - unless it's sugar free jello, because all it means is that it doesn't have sucrose (table sugar) but can have sugar alcohols and other glucose-raising additives in it that will raise blood glucose levels.
One trick I learned from a physician who had type 1 diabetes was that ALL whipped toppings (Cool Whip, Redi Whip, etc) is low carb. So, if you're trying to be really accommodating, get some sugar free Jell-O, some whipped topping and let all the kids in the class have fun.
You can also reach out to the student's parents to see what they'd recommend. Some people with Type 1 diabetes are "brittle" meaning their bodies react at the slightest levels of glucose and insulin making their blood sugars more difficult to regulate.
You can also see lots of good recipe ideas at the following sites:
http://www.changingdiabetes-us.com/
http://www.lillydiabetes.com/index.jsp
http://www.goinsulin.com/
http://rileychildrenshospital.com/parents-and-patients/pr...