Varied clothing/theme style depending on the theme you want them on
Designs reflecting any particular character trait of your choice
Any other theme/detail you find relevant
The concepts will be sketches with a basic coloring (may be base colors or simple shading)
If you want to actively participate in the creation of the design, I can do it Live (In Picarto.tv) So that you can do it freely. you may also link the stream to anyone you would want an opinion from. As of now, I cannot do private streams (It's very rare for people to come to my streams anyway).
You may use the designs as you may, use them as official designs for a projects if you want, however, the art itself can't be used for commercial purposes without a license (available as an extra).