Hi Esmeralda,
I have only designed one spread myself, but basically it was because I couldn't find one that felt right for my question. So I just thought about what I wanted to know and made up meanings for the positions. Nothing too creative, but mine none the less.
If you do create some I would love to see them in the Your Spreads forum.
By the way I did check out your site and it seems to me that you have a lot of creativity. I think you could create some very interesting spreads.
Take Care,
Mimers