I have no clue because I don't have a blog or a TpT store, but you could also e-mail a fellow blogger like Anna Brantley or Cara Carroll. They are wonderful people, and they would be able to answer your question. Sorry, I am of no help! :(
I use KPM doddles she lets you use the graphics for educational purposes with no liscence! She has a blog and an ETSY store.AmyThe Resource(ful) Room
Thanks Amy! I didn't think of looking at Etsy, but I found some great ones that will let you use to create!