For my class at Biblical Seminary, I had to write my own Psalm of Lament. [Please don't comment saying something like "thou shalt not add or take away from Scripture"]. The purpose was to understand the structure of a Psalm of Lament by writing one.
Of Evan Curry
Rescue me, O God, by your strength,
and present me as righteous, O God, by your justice.
Turn your face towards me and listen, my Lord,
Do not turn a deaf ear to what I bid of you.
For you I have worked with great angst,
For you I have offered my every part of me,
But you, O God, have not returned such a favor.
The Lord has done mighty deeds for saints of old,
Surely, he is still strong enough to rescue even me.
May those who ignore you be humbled,
Put an end to the success of the wicked.
But for you alone will I continue to carry this cross,
I will praise you for your might deeds.
For the Lord has been faithful to deliver his people,
and he will also rescue me out of despair.