Here are a couple sketches I've just "finished" if sketches are really ever finished... And another character I designed for the weekly conceptart.org ChOW competition.
This is the ChOW entry I did. She is the Spirit of Life. The design brief was to create a character that was to be the opposite of the character Death (black robe, scyth etc..) this is what I came up with. She's incandescent and slightly transparent revealing (if you look close enough) her veins and beating heart and she wears a crown of robins which are a symbol of spiritual rebirth.
A quick and strange vehicle concept. tripod style. you'd get in by hopping in a seat at the back and those two big bars would swing you over and into the main "pilot hole" :)