[KyleGoetz]

And because I see another place where Nagoyankee hasn't answered every possible relevant topic with brilliance, I'd like to chime in on how the construction "made by me" would be made in Japanese (assuming you're not signing a painting, but rather saying some rice was made by you or something):

As the phrase "made by me" is in the passive voice in English, you have to use the passive in Japanese. In Japanese, you form the passive of godan verbs by adding the あ-column ending and れる to the end of the stem of a godan verb. 作る is a godan verb.

Thus, you have
作る---->作られる (to be made)
Now make it past tense
作られる--->作られた (was made)
Now add the "by me"
作られた--->私に作られた (made by me)

Now, for an example
This car was made by me.
この車は私に作られた。