Yeah what MtMckinley said, those boxes need to be uv'ed for proper texturing.

Try doing a simple Planar Uv and then look under your panel and look for the uv editor. There you can see your brand new uv lined up all weird, make it fit that box that probably has a brick wall behind it, scale it until it looks good. There are some other details you can do to further the result so check out some text tutorials.

If you have problems finding them try googling or searching at sites like Higend3d

I hope it helped a little. I remember starting with UV mapping and I hated it alot.