I think it’s great to use the material that you had for your own VBS to use with our kids. Just remember that most of them speak English as a second language, so their reading ability may not be all that great. Don’t worry if another group has already used the same material. With the kids we’re working with repetition is not necessarily a bad thing.
My partners at Mission Arlington in Texas have developed some fantastic Bible story material. For ideas about presentations for the Backyard Bible Club check out Mission Arlington Curriculum. You will need Adobe Acrobat Reader or Foxit Reader to see these files (and for the maps to the missions!).
If you need some ideas on simple crafts to do with the kids at the missions check out these links:
Supplies can be bought at Michael’s which is across the street from Northlake Mall on LaVista Road, or at Office Depot, which is on Peachtree Industrial just around the corner from Azalea Mission.