I have been asked to make some watermelon shaped cookies for a school party at my ds school. Not a problem I can do that. I will be using the NFSC recipe and dying the dough colors to make a watermelon cookie. Simple enough - i can do that. I bought some chocolate covered sunflower seeds that I will be using as the seeds .... (awesome idea)....

so what do I use to attach them since they will be applied after the cookies cool?

A bit of Royal icing..but the cookies can't be warm or it will melt.

You can mix a bit of p.sugar w/a drop or two of water w/o having to make a batch of royal - unless you want to or have some on hand.
You also could use melted chocolate

Our schools here in TX don't allow any kind of nuts in baked goods that will be eaten by the kiddos! Some have even said no to peanut butter. Anywho, I'd stick to the royal icing, although the melted chocolate sounds delish!

If you put them on when the cookies are still hot, wouldn't the chocolate melt the seeds to the cookie?