Usually I give out pencils for birthdays, and I probably still will... but I wanted to give the kids something that I KNOW they will like as well... glow sticks! They are cheap (usually I can get a 12 pack at Michaels for $1), but they absolutely love it.
I printed the cards on colored card stock to make them last a while (it's 2 per page), and now they are ready for school. Hope this helps you. :)
Have a great day!