There's a software online that I've never heard of called "Canva". It's a design software that cloud based so you can work with a team of designers to create whatever you need and it's free too. However, I must admit, I personally have never tried this online program so I don't know just how good (or bad) it really is. I don't even know if it's capable of vector graphics like XDP or Ai or if it's more like Ps (or Gimp). Check it out and tell me what you think of it:

http://www.canva.com/