My personal favorite—and one that I use all the time—is Goodness gracious, or simply Goodness. This one is unique in that it uses one of God's main attributes in order to keep from breaking the Third Commandment. Though we're often told that God is good, Psalm 100:5 is one of the most straightforward verses in which the Bible states this.
For the Lord is good; his steadfast love endures forever, and his faithfulness to all generations.
✙ Ps 100:5 ✙
Human beings were created in the image of God. If I think of someone (or myself) as good, am I thereby lifting up that part of them in which I see God's goodness? What if I give a sycophantic compliment to a leader with narcissistic personality disorder, am I deifying someone who will not honor God? And perhaps most importantly, if I insult someone, am I thereby insulting something that is of God? There really is something to be learned from minced oaths, then: If I fear using God's Name in vain, I should also be wary of using vain speech to either build up or tear down those created in the image of God.
Help me think before I speak, Lord; guide my tongue as a speak; and bless the ears that listen to me. May the words of my mouth and the meditation of my heart be acceptable in your sight, my Rock and my Redeemer; and as my speech is intended to honor your image, may others assume the best of what I have said. I pray this in the Name of the One who perfectly reflected your goodness, who yet cautioned others before they thoughtlessly applied to him your attributes, even Jesus Christ, who taught me to pray...