ChromiteBlue.com

some very simple jumpers for Eagle3D, I tend to use a lot of them due to single-sided board restrictions.

the include file, to be placed in “[Eagle3D Root]/povray” and added to “[Eagle3D Root]/povray/user.inc”. see this post for details.
user_jumper.inc

and the associated images (to be placed in “[Eagle3D Root]/ulp/img” to aid in identification, optional):

Zip archive of images

and as requested, a rendered image and an example board:

Example Wire Jumper Board(jumper.brd)

additionally, if the correct user functions can not be found (or you would rather not look for them),
the following lines can be manually added to “EAGLE_ROOT/ulp/3dusrpac.dat”:

05:0:0:0:0:0:0:1:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:USER_WIREJUMPER_05MM(:USER_WIREJUMPER_05MM:
07:0:0:0:0:0:0:1:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:USER_WIREJUMPER_07MM(:USER_WIREJUMPER_07MM:
10:0:0:0:0:0:0:1:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:USER_WIREJUMPER_10MM(:USER_WIREJUMPER_10MM:
12:0:0:0:0:0:0:1:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:USER_WIREJUMPER_12MM(:USER_WIREJUMPER_12MM:
15:0:0:0:0:0:0:1:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:USER_WIREJUMPER_15MM(:USER_WIREJUMPER_15MM:

Update:
The above file is incompatible with newer versions of eagle. If you get errors with user_jumper.inc, try the following file:
user_jumper-54.inc
and adding #include “user_jumper-54.inc” rather than #include “user_jumper.inc” to /povray/user.inc