Hmm.. Well, my internet is currently down, i'm using my mobile phone browser. I could try uploading them, it'd probably work. Although i've never taken part in the production of a ROM Hack before. As far as i know, i'd only have to edit the sprites, just submit them to you, no? Also, i'd like to find out a few things first (have you made a thread for your hack?)-
1. What Rom is it based on?
2. What kind of sprites do you need? I can do Trainer sprites, but not overworld.