Thank you all for your help. I ended up going to Michaels and getting the craft sand and glueing it on. I couldn't find a good applicator for glue so I used my Zig glue pen and it worked pretty good. I got more glue than I wanted on in some places but they thought it was great because it looked like sand dunes. I'm not sure about it but had to get the card done.
I'm going to attempt to send a pic of it so hope it works. Anyway, he was really impressed