How about Launch Pads?http://www.disconcepts.com/LAUNCH%20PAD.htm
These might be too expensive but are rather interesting,
"No more greasey, muddy grass tees.
No more grotty bitumen (black top) tee strips.
No more large expensive concrete slabs
Virtual Security assured
Relatively inexpensive construction, maintenance free that allows itself to blend in with the environment, while giving protection to that very same environment."http://www.discgolfaustralia.com.au/index_files/Page431.htm
Here's another company with their design the QuaBoing® Runway Disc Golf Tee Pad.http://www.recmanagement.com/rmnews/0710.quabung.pr.pdf
Or trapezoidal shaped concrete tees...Same as our current concrete tees, just add an extra foot on each side of the back of the tee. Something unique, for a unique course.
As for tee signs....http://www.innovadiscs.com/coursedesign/ifosigns.html
Or the famous John Houck could help, these are some really nice tee signs, but I think no matter what we should use a metal post for our signs...I've heard bad stories about the beavers out at Unger...http://www.houckdesign.com/tee_sign_gallery.html
Please don't get signs like this...http://www.discgolfassoc.com/discgolf-equipment/tee-signs/