I use this to have students self-grade once each term for participation. It is a 100 point participation rubric - but LETTERS are used instead of points. It could be easily edited for points.
This is a MSWord document so it can be edited to tailor it to your classroom needs. It now includes corresponding pictures (for each rubric box) as well as a standard about appropriate use of technology.
I usually have students SELF-EVALUATE right on this paper, then write me a letter on the back (blank) about why they assigned themselves that particular grade. Typically they are harder on themselves than I would be :) so I adjust, write back to them, and turn it back!