in my opinion.

He's got red walls and a green carpet which, to my mind, look awful.

Usage notes: sometimes used in the form to someone's mind:

The professor made a comment about her appearance that, to her mind, was not appropriate.

• at someone's beck and call
• at someone's elbow
• at someone's heels
• at someone's knee
• at someone's service
• at stake
• attend to
• attend to someone
• attend to something
• at the back of beyond
• at the back of mind
• at the back of your mind
• at the best of times
• at the bottom of the heap
• at the bottom of the ladder
• at the bottom of the pile
• at the chalkface
• at the coalface
• at the crack of dawn
• at the cutting edge
• at the double
• at the drop of a hat
• at the eleventh hour
• at the end of the day
• at the expense of