If you want to participate in either concept design work or actually making some art stuff for Hive13 we now have a wiki page/gallery setup to view and share ideas, WIPs, finished works, etc.
http://wiki.hive13.org/wiki/Hive13_Art
There is also a mailing list propaganda@hive13.org. Use that to send raw versions (svg, blend) whatever to the group. Also if you have a sketch that you want somebody to “clean up” you could mail that to the group as well (if you are too shy to post your raw sketch). If you want to be added to the group you can send an email to membership or directly to propaganda or jump on IRC.
–Craig