This may be too young as my son is only 6 and we have done this two year already...but it is still fun.,,
Take an envelope and write each child's name on it in dark sharpy.
Take a baking sheet, line it with foil, and then put it on medium to low on the stove. Then we take some old crayons and swirl designs on it and place an envelope to soak up the design. You will need to gently blot or press the back of the envelope with a paper towel and then gently peel the envelope up. It doesn't need to be down for more than a few seconds total. Lighter colours work better otherwise they overwhelm the name.
Also, make sure you hold the adhesive side of the evelope up while you blot the back to soak up the colours, or you will actually heat seal the envelope!
Once cooled, you can then fill the envelopes with items, seal them up with a sticker on the back, and then pass them out at school.
Items can be from a party or dollar store:
Fancy pencils
Erasers
Stickers
Tattoos (be careful, some parents are not thrilled with these)
Seeds
Candy
etc
You will want to verify with the teacher that the above is, indeed, ok. Since my son's birthday is on February 14th, we combine it with Valentines.